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

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)