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Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAboutGMC Data Report No. 106An examination and interpretation of megafossil fragments and
microfossils from cuttings of the Arco Alaska Hemi Springs State
No. I well
Received 27 January 1989
Total of 3 pages in report
Geologic Materials Center Data Report No. 106
AR CO HEM ! S PR IN GS STATE #1
API# 50-029-21056
IN TRODU CT ION
Composite 180' samples from 80-10,944' were analyzed.
By using composite samples of 180', the faunal content of each sample is
so diluted that very few specimens represent the individual species. The
top of the ages could be in error by 360' and ages present in t~in
intervals are probably missed completely.
RESULTS
De pt h
80-4410' Age: Indeterminate.
Pal eoenvironment: Indeterminate
Remarks: This interval is barren of microfossils.
4410-5430'
Age: Late Cretaceous.
Pal eoen vi ronmen t: Probably shelf, inner to middle
n eri ti c.
Remarks: The . faunal assemblage consists of
Hap.1 ophra~lmoi des excavata H. albertensis
Verneuil inoides fischeri, an~ 'Bathys-(phon varians.
5,430-6,410'
Age.: Indeterminate.
Pal eoenvironmen t: Indeterminate.
6,41 O' -7,030'
7,030'-7,240'
Remarks: The rare occurrences of Haplophragmoides
rota and H. excavata are assumed to be caved.
Age_: Possibly Campanian/Turonian.
Paleoenvironment: Probably s~elf,
ba thya 1.
(outer neriti c) to
Remarks: The faunal assemblage consists of
Inoceramus prisms, _speci es Se thocyrti s spp.,
Cenosphaera spp., and Dictyomitra multicostata.
Age: Possibly late early Cretaceous.
Pal eoenvi ronmen t:
Probably shelf (outer neritic) to
ba thyal.
GMC Data Report No. 106 Page 1/3
7,240'-7,450'
7,450'-7,660'
7,660' -7,840'
7,870' -8,470'
Remarks' The fauna in this interval consists only of
Li thocampe, spp.
Age- Aptian/Barrimian.
Paleoenvironment: Probably middle neritic to bathyal.
Remarks' The faunal assemblage consists of Gaudr),ina
taileuri Haplophra~moides coronis, H. duoflatis H.
~oodenou ghens ii', T'ro chamm ina sq~ma ta and -g.
~n fl a'ti'gran di s. -
Age: Val angin ian/Berrias ian.
Paleoenvironment: Shelf probably outer neritic.
Remarks; The faunal assemblage consists of
A~mobaculites fra~mentarius, A. alaskensis, Gaudrsina
~illeri, G. taille'uri, Globu~fina prisc~-~-, Glomospira
subarctic~ Haplophra~moides coronis, H. 'd'uoflatis,
H. .gooden'oughensis,' H. inflatigrandis~ Lenticulina
~uensteri and TrochammTna .septagonalis.
Age: Possibly Late Jurassic.
Paleoenvironment' Marine, probably middle to outer
n eri tic.
Remarks: The faunal assemblage consists of
Ammobaculites alaskensis, Ammodiscus cheradospiri, s,
Leni~iculina vol~ensis, 'Marginulinap~is cephalotes,
Oolina apiculata, and Rectoglandulina hamcilis.
Age' Possibly Oxfordian/Callovian.
Paleoenvironment: Open marine, probably middle to
outer neritic.
Remarks: The faunal assemblage consists of
'~mmobaculite cf A. cobbani, A. barrowensis, Dental ina
exilis,' GloOuli~a topagorukensis, Haplophra~moides'
canui, Lenticulina ' audax Recurvoides turbinatus.
A~modiscus asperus, Astacolus dubius, Citnarina
ent;~poma, tus., Marginul ihOpsis phragmites, Nodosaria
aphelol..ocul a, Reophax 1 iassica and Len'l~i'cul ina'
quenstedi. This fauna has been observed in Oxfordian
- Callovian strata.
GMC
Data Report
No.
106
-2-
Page 2/3
8,500'-9,310'
9,340'-9,52]
9,550' -10,360'
10,3 90' -10,944'
Age: Possibly Middle Jurassic.
Paleoenvironment: Marine.
Remarks: Faunal assemblage consists
(megas pores ), Ammodiscus
anomalocoelia. The fauna
that was observed uphole is
Age: Triassic.
Paleoenvironment: Marine, probab]y shelf.
of Tasman ires
siliceus and Bathysiphon
present in this interval
cons i dered caved.
Remarks- Astacolus connudatus, Haplophragmoides cf.
H. vetusta, and M6~ ti s/H~iobia fragments were
-6bserved in this interval.
A e: Permian to Early Triassic
~o~sul . )
tan ts, Inc
(by Mi cropaleo
Paleoenvironment: Non-marine to marginal marine
(MCI).
Remarks: The fauna observed by MCI includes
Ammodiscus spp. and Penna? spp.
A~)e: Late Mississipian to Pennsylvanian
Paleoenvironment: Shoaling shelf (MCI).
(by MCI).
Remarks: Samples are barren of Foraminifera in
washed sampl es. However, Pal eozoi c fauna was
observed in cuttings (MCI).
GMC
Data Report No. 106
-3-
Page 3/3
