Geologic Studies in Alaska by the U.S. Geological Survey, 1992

Table 1. Conodont faunules and lithologies, upper part of Kayak Shale and Lisburne Group, western lvotuk Hills, Killik River B-5 quadrangle, Alaska-Continued
Lisburne Group
(lower unit)
Lisburne Group
(middle unit)
FIELD NO.
(USGS COLLN.NO.)
AND POSTTION
ABOVE BASE OF
Lisburne Grouo I 90AD59- 190: 1
(upper unit)
Lisburne ~ r o u ~
L A D E NJ
LONGITUDE W.
68"28'50"/
155"42'45"
(base of section);
68"28'38"1
155"42'45"
(top of section)
190 m
92AD41A 1 68"28'36"/
LITHOLOGY AND CONODONT FAUNULE
Crinoidal packstonelgrainstone.
47 Pa element fragments Bisapthodus utahensis Sandberg
and Gutschick (fig. 81-0
Klndognuthus sp. indet. (fig. 8M)
7 unassigned M elements
94 indet. bar, blade, and platform fragments
I Bryozoan crinoidal wackestone.
19 Pa elements Bisupthodus lrrahensis Sandberg and
Gutschick (fig. 8G, H)
2 Pa element fragments Cavusgnarhus sp.
Klodognarhus sp. indet. (fig. 8L)
3 Sa and 5 Sc elements
1 unassigned Sc element
52 indet. bar, blade, and platform fragments
Thin-bedded dolostone.
Dolostone containing sparse bioclasts and gray,
noncalcareous to slightly calcareous shale partings.
3 indet. bar and blade fragments
Thin-bedded, fine-grained carbonate rocks.
5 incomplete and (or) juvenile Pa elements Gnathodus
bilinearus (Roundy) (fig. 8A)
4 Pa elements Gnathodus defectus Dunn (fig. 8 B)
1 Pa element Gnathodus girtyi simplex Dunn (fig. 8 C)
15 indet. bar, blade, and platform fragments
FOSSlL AGE, BIOFACES, AND
CAI
early Late Mississippian
(late Meramecian).
Biofacies indeterminate: faunule
represents postmortem mixing
of shallow- to deeper water and
(or) pelagic species.
CAI=]-1.5
early Late Mississippian
(late Meramecian).
Bisapthodid(?) biofacies or
mixing of pelagic and shallow-
water elements.
CAT=[-1.5
Probably late Late Mississippian
(Chesterian) on the basis of
conodonts in USGS colln.
29982-PC (see below).
Biofacies indeterminate.
CAI=l-1.5
Very latest Mississippian . - (latest
~heiterian).
Too few specimens for biofacies
analysis, but faunule indicates
normal-marine depositional
environment.
CAT=I .5
REMARKS
Representatives of 6.
utahensis are more complete
than in the collections from
the lower unit suggesting
considerably less
postmortem transport.
I Sample is about 1 m below
top of exposure and may be
uppermost part of Lisburne;
about 30 m of cover separates
this sample from the top of
the measured section.
Sample from I I m below top
of Lisburne Group. Base of
Siksikpuk Formation
exposed at this locality.
Sample may be equivalent to
a level within the highest
covered interval (see fig. 3)
in measured section 90AD59.
Samples with the prefix
85ASi were collected by J.P.
Siok, Terrasat Corporation,
Anchorage, AK, while he was
a graduate student at the
University of Alaska
Barren. Sample from uppermost part
of Lisburne Group,
immediately beneath
Siksikpuk Formation.