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Home My WebLink AboutGMC Data Report No. 177Palynological analysis of core (342.9' to 1037') from the U. S. Navy Umiat Test Well No. 11. Received 29 October 1990 TOtal of 20 pages in report Alaska Geologic Materials Center Data Report No. 177 Palynological analysis of core from the U. 11 GMC Data Report No. 177 S. Navy Umiat Test well No. Page 1/20 Sample Code Depth U.A. 342.9' U.B. "' 345.5' U.C. 392.3' U.D. 462.5' U.E. 546.2' U.F. 547' U.G. 561.2' U.H. 709.6' U.I. 716.4' U.J. 723' U.K. 762.5' U.L. - 778.5' U.M. 1032' U.N. 1037' GMC Data Report No. 177 Page 1/20 PALYNOLOGICAL ANALYSIS OF 14 OUTCROP SAMPLES FROM THE CRETACEOUS OF ALASKA . - Report No. 90-0012 April 1990 BuJak Davies GrOUp Calgary, Alberta i.. GMC Data Report No. 177 · o Page 2/20 BuJak Davies Group ARCO~a~ 1990 .... 1 PALYNOLOGICAL ANALYSIS OF 14 OUTCROP SAMPLES FROM THE CRETACEOUS OF ALASKA INTRODUCTION This report discusses the results of palynological analyses of 14 outcrop samples from the Cretaceous of Alaska which were submitted to the Bujak Davies Group by James Talbot of ARCO O11 and Gas Co. All of the samples were all processed at the Bujak Davies laboratories In Calgan/. During palynological analysis, a kerogen slide, coarse fraction palynological slide (greater than 20 microns), and a fine fraction palynological slide (less than 20 microns) were examined to determine the relative abundances of the total reworked and in situ palynologlcal assemblages in each sample. Palynological zonal and age determinations of the samples mainly utilized Index species of marine dinoflagellates plus the spores and pollen of terrestrial plants. . ~ Rare fungal palynomorphs observed in some samples represent taxa'with long stratigraphic ranges, so that these specimens provided little Information on the age of the samples. The integrated Cenozoic-Mesozoic palynological zonation used for the biostrati- graphic subdivision and age determinations of. the 14 samples has not been published but is shown in Figure 1. This zonation has been developed in-house by the Bujak Davies Group and is generally consistent with that used by the Geological Survey of Canada and various petroleum exploration groups drilling in the Cana- dian Beaufort Sea and Alaskan North slope. The zonation has been published in part by Norris (1986) for the Oligocene to Pleistocene based on his analysis of the Nuldak C-22 well, Canadian Beaufort Sea, but additionally uhlizes the occurrences of marine Miocene dinoflagellates recog- nized through the use of fluorescence microscopy. The Cenozoic zonation is also partially based on earlier published work by Doerenkamp et al. (1976), Rouse (1977) and Staplin (1976) for the Paleogene section. The Mesozoic palynological zonation used in the present study is primarily based on unpublished data from North Slope Alaskan surface and subsurface sections due to the scarcity of published Alaskan information, plus published and unpublished data from the adjacent MacKenzie Delta and other relevant Arctic regions. GMC Data Report No. 177 P~ge 3/20 BuJak Davies Group ARCO Alaska April 1990 .... 2 Published data on the Cretaceous 'have been synthesized by the Bujak Davies Group (1984) and Include the following papers: Brideaux (1976, 1977), Brideaux & Fisher (1976), Brideaux & Mclntyre (1973, 1975), Brideaux & Myhr (1976), Brideaux et al. (1975, 1976), Davies (1979, 1983), Doerenkamp et al. (1976), Felix & Burbridge (1973, 1976), Manure & Cookson (1964), Mc lntyre (1974,1975), Mclntyre & Brideaux (1980), and Sweet (1978). Published data on the Jurassic are rare and include Brideaux (1977), Brideaux & Fisher (1976), and Davies (1979,1983), plus the Northern Hemisphere Oxfordlan and younger Miospore Atlas of the Bujak Davies Group (1986) whlch also discusses the Berriasian to Turonlan section. FORMAT In the following report, the examined samples are listed in alphabetic order, with a discussion of the zonal/age justification, and the interpreted paleoenvironment based on palynology. Within each sample, all of the oibserved taxa are listed and are grouped into the following categories reflecting their affinities and habitats: marine dinoflagellcrtes other algae terrestrial pollen and spores fungi The following categories of relative abundances are denoted, with undenoted abundances representing a single observed specimen: Present: Rare: Few: Common: Abundant: one specimen two to four specimens five to 19 specimens 20 to 49 specimens more than 50 specimens Data Report No. 177 Page 4/20 . Bujak Davies G~oup ARCO Alaska Apdl 1990 .... 3 AGE d# ZONATK~ KIMMERIDGIAN '"is ~ eua~ ~4 AGE Tm ZONATION Figure 1. Bujak Davies Group Late Triassic to Pleistocene palynological zonation, Canadian Beaufort and Alaskan North Slope. GMC Data Report No. 177 Page 5/20 Bujak Davies Group AI~O Alaska Apdl 1990 ....4 BIOSTRATIGRAPHIC SUMMARY l_mS~ple/~, ~ ~.~,-C~- Age and Zone U.A. ~1 ~.~ Late Conlaclan to early Santonlan Chatanglella verrucosa Zone ~.B. ~q~'.S" late Turonlan to early Conlaclan Eurydinlum glomeratum Zone ] U.C. -~,1~.7~' probable early to ?middle Albion Vesperopsis maylZone U.D. ~/[~..$' Aptlan lo early - ?middle Albion Pseudoceratlum reglum lo Vesperopsis mayl Zone U.E. ~ ~,, ~r 'middle Albion Chlchaouadinlum vestitum Zone ~ U.F. ~cl-~ .' probable early to ?middle Albion Vesperopsis mayiZone. ~U.G. 2-r.~, 2.' late Santonlan Chatangiella ditissima Zone VU.H. "Fol.(.' late Turonlan to early Conlaclan Eurydinlum glomeratumZone ~U.I. -t i ~,,-I' early Turonlan Isabelidinlum magnum Zone early Turonlan Isabelldinium magnum Zone wlth CenOmanlan to Albion reworking ~U.K. ~ ro ~,s' late Apllan or older Oligosphaeridium asterigerum Zone, or possiblyas old as early Aptlan rZU.L ~'~'£' early to ?middle Albion Vesperopsi$ mayiZone r~.M. / 0:s~,' probable middle to late Albion Chlchaouadinlum vestitum to Chlchaouadinlum davldii Zones "(U.N. lc> either (1) early to ?middle Albion Vesperopsis may/Zone or (2) Turonlan Eurydinlum glomeratum Zone with Alblan reworklng~ ' GMC Data Report No. !77 Page 6/20 . . Bu~ak Davies Group ARCO Ala~a Apfll 1990 ....5 PALYNOLOGICAL ASSEMBLAGE DESCRIPTIONS Unles~ otherwise noted, ~"~gle specimens were ob- served. (+) Indicates a marker specle~ ]: Somole desl_onatl~l~l.' t,,..GUJGEGD Age & Zone late .Conloclan to early Santonlan Chatanglella verrucosa Zone Dlnoflagellates Astrocystra cretacea (Abundant) Canningla collivefl (Common) Chatanglellascheft (+) (Rare) Chatangiella sp. 1, BuJak 1985 (+) (Common) Chatanglella sp. 2,1~41ak 1985 (+) (Common) Chatangiella vem.~'osa (+) (Rare) Ginginodinlum omatum (+) (Common) IsabeEdinlum magnum (Common) Laclniadinlurn biconiculatum (+) (Rare) Pseudocerafium sp. 1, B~ak 1985 (+) Sp/n/dn/urn sverd~up/~ (+) (Common) Trithyrodinium suspectum (+) (Common) Other Algae No taxa observed. Pollen A;~sporttes,~pp. (Abundmt) Taxoc~aceaepoEenttes hiatus (Abundant) Cama~ozonospo~es ~ Clcatricostspofltes mohrioides Cyathidites austra~s (Ab~'ldant) Cyathldltes minor (Common) GlelchenSdites minor Glelcheniic#tes senonicus (Rare) LaevigcTtospo#tes ovc#us (Common) Lycopodiurnsporites austroctavttidites Lycopodiurnsporftes margtnatus Osmundaclc~tes welrnann~ (Common) Stere~K~rtes anflquaspo#tes (Abundant) Stere/spot/testa/nor (Common) Stere~porltes reglum (Common) Fungal Spores No taxa observed. Reworked Palynomorphs Densospofltes spp. Paleoenvlronment Neriflc modne Comments Dinoflagellates are abundant In this samples, Inclucl- lng several species whose association Indicated assignment to the Chatant~e#a verrucosa Zone. Miospores are also abundant, with ali of the ob- served taxa being fairly long-ranging straflgraphl- cally. Their association with abundant marine dinoflagellates reflects a nedflc marine environment with the common Input of terrestrial material to the depositional site. 2: Sarnole deslanatlon: U.B. outcron Age & Zone late Turonlan to early Conlaclan Euryd/n/L~ glorneratum Zone Dinoflagellates Astrocystra cretacea Gen. et sp. Indet. 1, BuJak 1985 (+) (Common) Nelsonlella oceras sensu McIntyre 1974 (+) Other Algae No taxa observed. GMC Data Report No. t77 Page 7/20 ARCO Alaska April 1990 .... 6 Pollen A//spor/tes ,pp. (Common) Taxodlaceaepollenttes hlafus (Rare) r-em and Mo~ Spore~ Cyath/d/te, amtrd/s (Abundant) Cyathldite~ minor ~t) GlelchenEdttes minor Laevigatck%oodte$ ovafu~ (Rare) Osrnundacldte~ weEmannli (Rare) Sterelsporlte$ anflquosporite$ (Rare) Stereisporites minor Fungal Spores t~urlc e~ae spor ltes spp. (Rare) Reworked Palynomorpl~ No taxa observed. Paleoenvlromnet Stressed 'mar/ne Comments Dtnoflagellates are rare in this sample and have Iow diversity, but' the taxa that occur Incllcate assign- ment to the E. gfomeratt~n Zone and a stressed marine depodflonal environment. Mlospores are more common, with rare fungal spores also being observed. 3: Somole deslo_ natlorc U.C. outcroD Age & Zone probable early to ? mlclcle AIblan, Ve~oerop~ may~ Zone Dlnoflagellates Ctenldodnlum ~ES, BanerJee & .l~)avles '88 (+) Other Algae Scfllzocysta parvus (Common) Pollen ' A//sportte~ spp. (Rare) Araucarlacite$ ousta~ Cycadoplte~ spp. Ephedrlplt~ codaNferm (+) Parvisaccltes amplus (+) PhY//oc/a~tes/nchoatus (+) (Rare) Taxodlaceaepollenite$ hiatus (Abundant) Ifltrelsporite$ pallldus Fern and Moss Spores Ciccrln'coslsporites d~r.F (+) .Ciccrtrlcodspodtes cocononlensis (+) (Rare) Cyathld!tes minor (Rare) Gleichenidites senorrlcus Laevigatosporites ovatus Lycopoc~umsporites austroclavificfites Osmundacidttes wellmannii (Domlnant) Sterelspodtes antlquaspodtes (Rare) Fungal Spores P~Jrlcellaesporites spp. Paleoenvlronmenl: Paralic to marginally marine with eu~thaline condi- tions. Dinoflagellates are rare consisting of opportunistic species; Euryhaline algal cysts are common. The mlospores are abundant with high-dominance In gymnospermous pollen and generalized fern spores. The somple locks the pdmary zonal morker species of the Vesperopsis mayE Zone but It contains several species that can be related to the te,igenous rolo- ,spore zonation (Subzones 11A-B) of equivalent age proposed by the Bujak Davies Group (1986) for lhe Nodh Amedca and E~ope. Ctenidodinlum sp. $ of BonerJee and Davies (1988) is kJ~wn from the Boffe- talon to Alblan Mannvllle Formation of Western Canada. Page 8/20 GMC Data Report No. 177 I 4: Somole deslanotion: U.D. outcroo Age & Zone Apflan to eady - ? middle Alblan Pse~Kfoc~aflurn reglum to Vesperopsls mayl Zone Dlnoflagellates Ctenldodinlum ~ES, BanerJee & Davies '88 (+) (Rare) Luxadintum sp. Indet. Other Algae Concentrlcystes minor Schlzocysta parvus (Rare) Pollen A//sporttes spp. (Rare) Cedrlp/tes canadends Laricoldites magnus (Rare) Parvlsaccfles arnplus (+) (Fragments) Peflnopollenites elatoides Taxodlaceaepollenites hlcrk= (Common) Fern and Moss Spores Cyott~d'tes oudr~ (CommorO Cyott~cgtesm/nor (Common) Densolspodtes mlcroretlctdotus GlelchenEdites senonlcus Laevlgotosporttes ovofus (Rare) L ycopodumsporttes oustroclavfficfrtes Osmundacicrrtes wefl~ (AbLrK:Jant) Sterelsporttes antiqu~es (Rare) RJngcd Spcxes Muttic~orltes spp. P(~eoemflronme~. Paralic to marglnally mabe with eu~fhdlne condi- tions. Comments Dinoflagellates are rare consisting of oppodunistic species. Euryhallne algal cysts are common. The mlospores are abundant with hlgh-dor~nance in gymnospermous pollen and generalized fern spores. ARCO Ak~a Apdl 1990 .... 7 The sample lacks the prtman/zonal marker species Alaskan North Slope -Beaufort palynologlcal zona- flon but it contains a few species that can be related to the terrlgenous rniospore zonaflon (Zones 10-11) of Apflan to Alblan age proposed by the Bujak Davies Group (1986) for the North Amedca and Europe. Ctenldodlnlum sp. S of Banedee and Davies (1988) Is known from the Barremlan to Alblan Mannvllle For- marion of Western Canada. 5: Samole designation: U,E. outcroo Age & Zone middle Albion Chlchaouadinlum vesfltum Zone Dlnoflageflates Astrocystra cretacea (Common) Chlchaouocllnlum ~EA (+) Chichaouadinlum vesfltum (+) Cleistosphaerldum huguonlofll (+) · .Ctenldocflnlum ~ES, BanerJee & Davies '88 Cyclonepheliurn disflncflJm Luxacflnlurn propatulum (+) (Rare) Maghrebina cingulata (+) (Rare) Odontochitlna operculata (Rare) Splniferites ramosus Sflphrosphoerlc~urn anthophorum (+) Other Algae Concenfflcysfls sp. A Schlzocysto parvus Pollen Alisporites spp. (Rare) Cedfip/tes canadensis (Rare) Parvisaccflte$ amp/us (+) (Rare) PeflnopoEenffes elatoldes Podocarp/cF[tes potomacense Taxodlaceaepollenites hlat~ V/tre/sporttespaffidus (Rare) (Rare) (Abundant) Fern and Moss Spores Chytroelsphaefldia dngnesoflum Cicat#coslspo~tes derK:cr/us (Common) Cicatricosisporttes rnohrioides Cicatdcosisporites problemcrttcus Cicatrlcosisporites subrotundus (Rare) Densoisporit es mlcrorugulotus GMC Data Report No. 177 Page 9/20 j. I. GMC GleichenEdlte~ senordcu~ Laevlgatosportte~ ovafu~ Leiotrllete~ mecldenburgends Leptolepldltes veflucosce Osmundaddlte~ wellmann~ (Common) Rouse~e~dmplex (Rare) Stere/spor/te~ ant/qu~e~ (Abundant) Paleoenvlronrnent: Marginally madne Comments Dlnoflogellates are common consisting of high taler- once madne specim. Ecwhallne algal cysts are rare. The mlospores are abundant ~vlth hlgh-clomlnance The presence of C. vesff/um, L.propatulum, C. huguonlot#, M. clngulata, C:'delicatus and C,~ul~otundce b Indicative Of'the middle Albion C. vediflJm Zone. 6: Samole dedanaflon: U.F. outcrop Age & Zone probable early to ? ~ddle Alblan Vesperopds mayl Zone Olnoflagellates Astrocystra cretacea No taxa present Poaen Araucarlacite~ omta~ Ceddpltes canadends Cerebropollenites mesozolcus (Rare) Pon4sacccrte$ ruglafus (+) Pan~sacdte$ amp/us (+) (Common) PhyEoclac~tes inchoatus (+) Taxodlaceaepoflenites hlak~ (Abundant) Vitreispoflte$ pallldus (Rare) Data Report No. !77 ARCO Alaska Apdi 1990 ....8 Fern and Moss Spores Acantho#lletes va~ptnosum (+) Clcatricodspo~e~ fEF (+) (Rare) Cicatdcodspodtes anmdafm (+) (Rare) Cyott~dltes audral~ Glelchenlldites senonlcus (Rare) Intedobltes #/angufar/s (+) (Rare) Laevigatospodtes ovotus (Common) Lycopodlurnspodtes oustroclovltidltes LycopocS~orltes marginafus Osmundacldites wellmannll Rouselsporit es drnplex Stereisporltes anflquasporites (Rare) (Oommon) (Common) Fungal Spores Pluricellaesp .ofltes sPP.. Poleoenvlr°nment: porolic Comments Dinoflagellates are very. rare cons[sting of a Stngle opportunistic species. The miospores are abundant With high-clomlnance In gymnospermous pollen and generalized fern spores. The sample lacks the pdmary zonal marker species of lhe, Vesperopds may# Zone but it contalns a several species that can be related to the terrigenous mio- spore zonaflon (Subzones 11A-B and possibly older) .of equivalent age proposed by the BuJak Davies Group (1986) for the North Amedca and Europe. Ctenidodnlumsp. S of BanerJee and Davies (1988) is knwon from the Barremlan to Alblan Mannville For- marion of Western Canada. 7: S~nole deslanatlon: U.G. outcroo Age & Zone late Santonlan Chatanglella d/riss/mc/Zone Dinoflagellales Astrocystra cretacea Collaiosphaeridium asymme#lcum (+) Chotanglella sp. 1, BuJak 1985 (+) (Common) Page 10/20 Bujak Davies Group AI"~O Alaska April 1990 .... 9 ChlamydophoreEa grossa (+) (Common) Chlamydophorella nyel (Rare) Cleistosphaeflcrun adculare (Rare) Cribropefldinlum ~p., Mclntyre 1974 (Common) Doroc~a #totes (+) Rorenttnla cooksOnlae Rorenflnla mantellE Glnglnodlnlum ornofu~ (+) (Rare) Hystrichodinlum pulchrum (Rare) Hystrichosphae#dum dfflcle (+) (Abundant) Hystrlchosphaeropsissp., Mcinlyre '74 (Common) Isabelidinlum amphlatum (Questlonablypresent) Isabellcllnlum magnern (Common) Lacinladinlum biconlcul~ (+) Laclnladinlurn orb/c~afurn (+) (Rare) Odontochitlna costata (Rare) Odontochiflna operculata (Common) Oligosphaefldi(~'n complex (Common) Oligosphaefldi~ pulch errimum (+) Pseudoceratlum sp., Mcintyre 1974 (Rare) Pterodlnlum sp. 1 Mcintyre 1974 Spinlferites dngulafus (Rare) Splnlferites ramosus sensu lato Trlthyrodinlum ~pectum (+) (Common) Xenascus cercrtioides Micrhystridlurn fragile (Common) Pollen A//spor/tesspp. (Abu~ant) Taxodiaceaepoflenttes hlatus (Abundant) Fern and Moss Spores Cicatricosisporites deiicat~ Converrucos/spo4tes exquisltus CyafNdtes au~traLs (Common) Cyatt~dtes m/nor (~ Laevigatospon?es ovatus (Common) Lycopodl~es oustrodovitldttes Osmundacldttes weJrnonr~ (Common) Sterelsporttes anffquaspodtes Sterelsporites minor (Rare) Fungal Spores Pluric ell aesporit es spp. Reworked Palynomorphs Densosporltes spp. Paleoenvlmnment nerlflc marine Comments Dinoflagellates are abundant and diverse in this sample, with most taxa Incllcating assignment to the C. ditisslma Zone. One exception Is a tentatively Identified specimen of Isabelic#nlum amphl~ which, if correctly Identified, would Indicate and age no older than the early Campanlan Chatang- lella coronata Zone. However, the poorly preserved specimen rnay represent bab~~ v4~k~h occurs In the ¢. d/tlssirna Zone. Miospores are also common to abundant in this sample and Include common water-transported fern spores. 8: Sample deslanafion: U.H, outcrop - Age & Zone late Turonlan to early Conlaclan glorneratum Zone Dlnoflagellates Chlarnydophorella nyel Cleistosphaeridiurn aciculare (Rare) Cribr opefldinturn sp. , McIntyre 1974 Gen. et sp. IrK:let. 1, BuJak 1985 (+) (Common) Isabelidinlurn magnum (+) (Rare) Nelsonlella aceras sensu Mclntyre "74 (+) (Common) Oligosphaerldlum complex Splniferite$ clngulofus Sptnlferttes romos~ sensu lato Tanyosphaerldlum xanthlopyxldes Other Algae Micrhystrldiurn fragile (Rare) Pollen Alisporifes spp. (AbundanO Taxodlaceaepollenites hiatus (Abundant) GMC Data Report No. 177 Page 11/20 Bujlak Davies Group ARCO Alaska Apfll 1990 .... 10 GMC Fem and Moss Spores Acanthotrlletes Va~ Carnarozorm~orlte~ Imlgnl~ Cyath/dte,s au~als (Common) Cyaft~dltes mlnor (Rare) Glelchenlldttes minor Laevigato~porite$ ovatus (Rare) Lycopocll~,mporites austrodaviNcEtes Osmundacldite$ wellmannll (Rare) Sterelspodtes antlquasportte$ (Common) Sterelsporlte$ rnlnor Fungal Spores Dlcellaesporlte$ sp. Indet. ' Reworked Palynomorphs Muderongla asymme~ca Paleoenvlronment stressed marine Comments Dinoflagellates are rare In ~ ~nple. but the popu- lation that ocurs b a Ngh-domi~e c~emblage Inclicaflng a strewed marine envlronmont. Miospores Inlcuding water-transported fern si:x~es are more common, reflecting some Input of tenlg~us mate- rial to the deposlflonal site. and lhb is supported by the presence of ram fungal spores, The rare marine dinofiogellates that occur Indicate assignment to the late Turonlan to early COnlaclan Eu/ydinlum glomeratu~ Zone. 9: Sample deslanatlon: U.I. outcrop Age & Zone ea~Turonlan Lsabe//~ magnum Zone Dlnoflagellate$ Asfrocydra cretacea (Rare) Cleistosphaeridlum aclculare (Common) Cyclonephellum ¢r~stlnctum (Rare) Dorocysta #totes (+) Exochosphaefldlum bifidum Gen. et sp. Indet. 1, BuJak 1985 (+) (Rare) Data Report No. 177 Hystrichodinlum lanceafum (Questionably present) Hystrichosphaeropds sp. Mclntyre '74 Isabelldinlum amphlafum (Questionably present) Isabelldinlum magnum (Rare) Nelsonlella acerassensuMchlyre 1974 (+) (Rare) Odontochitina costata Odontochitina operculata (Rare) Oligosphaeridlum complex (Common) Oligosphaefldium pulcherrimum cf. (+) Palaeohystrichophora infusodoides (Rare) Spinldinlum sverdruplanum (+) Splniferltes clngulafl~ Splnlferitesl'amosussensu lato (Rare) )gphophorlcllum alaflJrn ,~phophofldlum sp. 1 (+) Other Algae Mlcrhystridlum fragile Palambages spp. (Rare) Pollen Alisporites spp. (Abundant) Taxodiaceaepollentte$ hiatus (Abundant) Fern and Moss spores Acanthotrlletes var~ Cicatrlcosisporites mohdoldes Conflgnlsporites cooksonlae Costatoperforosporttes foveolatus Cyathldites austrarLs (Abundant) Cycrthldites minor (Rare) Foveotriletes trlangularis LaevigatosPorites ovatus (Rare) Lycopodiumspor{tes aus#oclaviticrrtes Lycopodiumspofltes marginafus ' Osmundacldites wellmannll (Rare) Sterelsporites anflqua~orites (Common) Sterelsporite$ minor (Common) r-ungal Spores Piuricellaesporites spp. Reworked Palynomorphs No tax~ observed. Paleoenvlroment nearshore marine Page 12/20 ARCO Alaska Apdl 1990 ....11 Dlnoflagellates and water-transported fern spores ore abundant In this sample, Indicating a neamhore marine environment with the common Input of ter- dgenous matedal to the depodflonal dte. Fungal spores and euwhallne algae are also rare. 10: Samole deslanaflon: U.J. outcroo Age & Zone early Turonlan /sabe//c~n/um magnum Zone with Cenomanlan to Alblan rewofldng Dlnoflogellate$ As#ocydra cretacea (Rare) Chatanglella sp. 1, B~ak1985 (+) (Rare) Chiomydophorella nyei Cletstosphaerlclurn aclcufare Cyclonephe#um dtsthctum (Rare) Gen. et sp. Indet. 1, BLdak 19t~,5 (+) (Rare) Hysfrichosphae#dum cifflcEe \ lsabeEdinlum magnum (+) (Rare) Lac~ad~nlum biconiculafum Odontochiflna operculata (Rare) Oligosphaefldurn n'mcrotubulurn Spir~erltm ramosm semu lato Trtthyrodnlum ~ (+) Other Algae No taxa observed. Pollen Ar~3o#t es spp. (Abundant) Pa~aalnlpollenites confusus (Ques~ present) Taxo~aceaepolenltes lYatus (Abundant) Acanthofdetes varispt~ Aequitriradttessp. (Questionably present) Cicatrlcodsporttes ha#el --Ctca~coslspofites mol~oides Cyaff~dites austrats (Common) Cyatt~c~tes minor (Rom) Gleicheniidites minor Glelcheniidites senor~cus (Rare) Laevigatospo#tes ovah.~ (Common) LycopocEumspofites austrodavltic#tes Lycopoc~urnspodtes marglncrtus Osrnundacldltes wellmannt~ (Abundant) Sterelsporites antiquaspofltes (CommOn) Sterelsporites mirror (AbLr~ant) Sterelsporltes reglum (Rare) Fungal Spores No taxa observed. Reworked Palynomorphs Aequitflracfltes splnulosus Luxadinlum propatulum Oiigosphaerldlum asteflgerum Porvisaccites amplus Poloeoenvlroment nearshore marine Comments Dinoflagellate: rare to common Mlospores: common to abundant PoleoenvironmenF. nearshore marine Sample deslgnation: U.J. Zone: Isabelldnium magnum Paleoenvlronment: nearshore marine Comments Dinoflogellates ore rare to common and comprise marginal to open marine species, with water-trans- ported fern spores belng abundant. Eun/hallne algal cysts are absent.. Most of the taxa that occur In, fi-ds sample Inc~cate assignment to the/sabe//d~n/um magnum Zone, but Alblan to Cenomanlan dinoflagellates and gymno- sperm pollen were also obselvecl and ore Inter- preted to be reworked, particularly due to the occur- rence of the genus Chatanglella. A questionably identified poorly preserved specimen of the pollen Paraalnipollenites confusus would Indicate assign- ment to strata no older than Maastrichtlan, provicra~ the specimen were correctly Identified. However, this Interpretation would Indicate that almost ail of GMC Data Report No. i77 Page 13/20 ARCO~a~ 1990 .... 12 the other palynomoq:~s in the sample are reworked. and the preferred hterpretatlon is that the sample ~ould be asdgned to the lsabelldlnlum magnin Zone. 11: Sample deslanaflon: U.IC outcrop Age & Zone late Apflan or older, Ofigosphaefldlum asterigerum Zone or posdbly as old as Early Apflan. Dlnoflagellales Eyrea nebulosa (Rare) Rorenflna cooksoniae (+) Luxadinlurn pdrnu~tJ"n (+) (Questionably present) OIIgosphaerid'~rn asteflgerum (+) (Rare) Odontochitina operdu~ata (corroded) Subtliispherasp. hdet. (Rare) Vesperopr~ maytl (+) Other Algae No taxa observed. Pollen Alisporites spp. (Rare). Aroucariocites ousta~s (Commen) Cedr/p/tm ca-~er~ (Abundant) ParvLsoccltes omplus (+) (Common) Ph~lodad#e~ hchoa~ (+) PIIcatella trlcornitata (+) Podocarptdites potornace'nsLs Podocarpldttes epb'trlatus Taxocflaceaepollenites hiatus (Abundant) V1#elsporites paliclus Fern and Mo~4 Spom~ Acanthotdletes vc~splnosum (+) Clcatricod~odtm dellcatm (+) Ciccrtrlcostsporttes potomacends (+) Glelchenldltes ~enonicus Interlobite~ frlang~arts (+) t~uklsportte$ foveolafus Lycopod~es austrocla~fldtte$ Osmundacidites welknannil (Rare) Fungal Spores No taxa observed. GMC Data Report No. 177 Paleoenvlronment: paralic to marginally marne Commenb Dinoflagellates are rare consisting of primarily oppor- tunistic species and the occadonal marine species. Euryholine algal cysts are obsenL 1he mlospores ore abundant with high-dominance In gymnospen~ous pollen and generaazed fern spores. Black coally material Is abundant. 1he association of O. asterlgerum, V. mayfL and L. prknu/um suggest asdgnment to the late Apron Oligosphaeridium osterigetum Zone although most species range down further Into the Apfian. The miospores are long-ranging Indicating a Barremlan to early Alblan Age. 12: Sample des~natlon: U.L oufcroo Age & Zone early - ? middle Alblan. Vesperopdsmayl Zone .Dlnoflagellates Astrocys#a cretaCea (+) (CommOn) CribropericJnitrn edWarddl (+) Ctenldodinlurn ~I~ES, BanerJee & Davies '88 (+) (Rare) Sfiphrosphaeridicrn anthophotum (+) (Questionably present) Sub flllsphaera sp. indet. Vesperospis moy~ (+) (questionably present) Olher Algae Pollen Allsporites spp. (Common) Araucarlacttes oustalLs (Common) Cedflpites canadends (Common) Parvisaccites amplus (+) Phyiloclac~rtes tnchoofus (+) Podocarpicr~tes epistrlatus Re fitric olpites vulgaris (+) Taxodiaceaepoflenltes hiatus (Abundant) Page 14/20 BuJak Davies Group ARCO Alaska Ap~ 1990 .... 13 Fern and Moss Spores Acrtto~oo~es excavatus (+) Aequlfrira~tes spinulosus Cicatrlcoslsporttes ~EF (+) Cyathldtte~ au~alls (Common) Gleichenildtte~ minor Glelchenlidite~ sor~lc~ (Rare) Granulaflsporites sp. A I(luklsporltes foveolatus Lycopodlumsporltes ausffodavt~'cEtes Osmundacldlte~ wollrnannll PIIcat ella problematicus (+) Podocarpldites epistrlafus Fungal Spores No taxa observed. Paleoenvlronment: Paralic to marginally marine Comments Dinoflagellates are rare consisting ofixknarlly oppor- tunistic species. Euryhallne algal cysts are rare. The mlospores are abundant with high-don~nance in gymnospermous pollen and genera~zed fern spores. The association of ?V. may#, Ct~um sp. $, C. edwardsii, Cicatric~es ~FEF, P. amp/us, P4~'oblemaflcus and R. vulgart~ suggests an assign- ment to the early to ?middle Albian Vesperopsts may~ Zone. 13: Sample deslanatlon: U.M. outcroo Age & Zone probable middle to late Alblan. Ch~uadn/um vest/turn to Ch/chaou~ davk~ Zones Dlnoflagellales Achomosphaera sp. Indet. Astrocystra cretacea Callalosphaefldlum asymme trlcurn (+) Cannlngla colliveri Chichaouadlnlum sp. indet. (+) q. ', Eyrea nebulosa Eurydinlurn glomeraturn (+) Fromea compllcata (+) Hystrlchodinlum pul~ (+)(Rare) Hys~chosphaefldlum difflclle(Quesfionably pres- ent) Imbotodlnlum Jaegeri (+) Luxodin/um p#mubm (+) (Questl~ present) Luxadnlum pr~ (+) (Questionably pres- ent) Maghrlblna cingulata (+) Odontochttlna operct~ata Ollgosphaeridium complex Paleohystri~ora Infusorioides Splnife#tes sp. lndet. Other Algae Schlzocysta parvus Pollen · Alispofltesspp. (Common) c~l~ :c,-,- < Parvlsaccites amplus (+) ~ Taxodlaceaepollenltes hlafus (Abundant) Vitrelspofltes pallidus Fern and Moss Spores AcanthotflTetes v 'at~oElCkSum Camarozonosporites instgnis Cicatflcosispo#tes annulafus (+) C~ybeltsporites panra3ceus (+) Cyathid#es auslr~ (Common) Distaltflangulisporttes costaft~ (+) (Rare) L eio tfile t es mectdenburgensts Lycopodlumspofltes austroclavttic~es L ycopodlumsporites marginatus Osmundaclcfltes we~nannli (Rare) R'losisporttes crosslongulorls Rouseispofltes reficulatus Stereisporites antiquasporttes Strlamonole tes aurttus (+) Fungal ~ores No taxa observed. Reworked Palynomorp~ Hymenozonosporttesteptolepidiphytes(Devonlan) Paleoenvlronment: Restricted marine with high freshwater influ0c GMC Data Report No. ]77 Page !5/20 BuJak Davies Group Comments Dinoflagellates are common consisting of primarily opportunbflc eu~yhaline species along with a few rare open marine species. Eu~hallne algal cysts are rare. The mlospor~ are abundant with hlgh-dornl- nance In gymnc~oerrnous pollen and generalized fern spores. The association of the dlnoflagellates Chlchaouad- lnlurn sp., E. glomer~, F. complicata, I./aege#, Lprimulum, L.propatukxn, and M. clngulata along wflh the mlospore$ C. annulafus, C. pannaceus, D. costcrtus and $.auflfus Inclicates assignment to the middle to late Alblan C. vestifl~ to C. davldll Zones ]4: Samr)le desl_anaflon: U.N. outcroo Age & Zone either (1) eaflyto ?middle AIblan Vesperopslsmoyl Zone, or (2) Turonlan Eurydrgum glomeratum Zone' with Cenomanlan reworking Dinoflagellates Asfrocystra cre tacea Cyclonephellum distincfum (Rare) Gen. et sp. Indef. 1, BuJak 1985 (+) (Common) buxadinlum prlmulum (?rewo~kea') Nelsonlella aceras sensu Mcintyre 1974 (+) (Questionably present) · Splnlferltes dngulafus Spinlferttes ramosus sensu lato (Rare) No taxa obsmved. Pollen Ar~spor/te~0p. (Common) ParvLsacclte$ omplus (Common) Taxodlaceaepollenltes hlatus (Abundant) Ulmlpollenltes undulosus (?contaminant) r-em and Moss Acanfho#iletes varisplrmsus ARCO Alaska Apfl11990 ....14 Cicatricoslsporlte$ hallel Clcatrlcoslspofltes moh#oides Cyathldlte$ australls (Common) Cyath/c~tesm/nor (Common) Laevigatosporltes ovafus (Rare) LycopodlumspoStes austroclavlfldlte$ Osmundacldite$ we#mann# (Common) Sterelsporlte$ anflquasporlte$ (Rare) Stereisporite$ minor (Rare) Fungal Spores .No taxa observed. Reworked Palynomorphs Densosporites spp. Paleoenvlronment' stressed marine Comments Dinoflagellates are extremely rare In thls sample and Include species Indicating c~lgnment to the Euryd- inium glomerafurn Zone. A angle specimen of the dinollagellate Luxadinlumprimulum would Indicate the Penetration of Cenom'anlan strata, providing the observed specimen were In place. A specimen of the angiosperm pollen Uimipollenltes undulosus is Interpreted to be a modern contami- nant. 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WILLIAMS G.L & BUJAK, J.P. 1980 Palynological stratigraphy of DSDP Site 416A. In: Lancelot, Y., Winterero E.L. et al.,Initial Reports of the Deep Sea Drilling Project, vol. 50,- pp. 467-495. (United States Government Printing Office). WILLIAMS, G.L & BUJAK, J.P. 1985 Mesozoic and Cenozoic dinoflagellates. In: Plankton Stratigraphy; Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (eds.).' Cambridge University Press, pp. 846-964. GMC Data Report No. 177 Page 20/20