McCann Hill Chert, Nation-Tatonduk Rivers Area (Tentaculitida) (Devonian of the United States)

Where: Alaska (65.0° N, 141.0° W: paleocoordinates 3.0° S, 38.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: McCann Hill Chert Formation, Emsian (407.6 - 393.3 Ma)

• 200-800 ft. thick

Environment/lithology: open shallow subtidal; cherty/siliceous shale and limestone

• high energy, shallow water
• thin-bedded chert and shale with richly fossilferous limestone basal beds (rhythmically and interbedded limestone)

Size class: macrofossils

Preservation: mold/impression, adpression, replaced with pyrite

Collected by Churkin and Carter; reposited in the USNM

Collection methods: chemical,

• etched out of limestone with Formic Acid

Primary reference: M. Churkin and C. Carter. 1970. Devonian tentaculitids of east-central Alaska; systematics and biostratigraphic significance. Journal of Paleontology 44(1):51-68 [A. Miller/J. Wittmer]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 79135: authorized by Arnold Miller, entered by Jacalyn Wittmer on 26.02.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
Lophophorata
 Tentaculitida - Contractenidae
 Tentaculitida - Uniconidae
 Tentaculitida - Multiconidae
Multiconus sp. Ljaschenko 1955
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Tentaculita
 Nowakiida - Striatostyliolinidae
Striatostyliolina sp. Boucek and Prantl 1961
 Nowakiida - Nowakiidae
 Styliolinida - Styliolinidae
Styliolina sp. Karpinsky 1884
 Volynitida - Dicricoconidae
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Conodonta
  -
Conodonta indet. Eichenberg 1930 conodont
Gnathostomata
  -
Actinopterygii indet. ray-finned fish
Anthozoa
  -
Anthozoa indet. Ehrenberg 1834