Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Rock Creek Area G-493B
Bottom Measured from base of bentonite under upper Ammudite
cone layer.
0-22 Beatonite (Sample 493B #1)
56 Dark gray to black shale, (ventricular fossil)
cords at base. (Upper Ammudite zone), rusty
streak at top. (Sample 493B #2)
68 Dark gray to black shale, rusty streak (1/2')
18" from base (Sample 493B #3.)
3 to 5 Bentonite
59 Dark gray to black shale 1" bentonite bed
at top. (Sample 493B #4) rusty
streak 39 inches above base.
sample 493B #4 lower 39", 493 B #5 upper 20"
38 Dark gray shale, brownish streak 1/2" rusty streak
at top. New device argillaceous coal in lower 1/2.
sample # 493 B-6
54 Dk Gray shale, brown streaky -
(Sample 493B-7)
22 As above
(Sample 493B-8)
2 to 8 Bentonite
47 Gray to brownish shale (weathered)
becoming silty in upper part
with intercalated thin layers of
shaly siltstone.
(Sample 493 B-9)
4 to 6 Platey siltstone, rusty, thin micracks.
Fresh fossils + comminuted plant material
scattered thru. Few clam parts preserved.