D193-SD Yukon River Valley section (Ordovician to of the United States)

Where: Alaska (65.0° N, 141.2° W: paleocoordinates 12.7° N, 58.3° W)

When: Road River Formation, Ashgill to Ashgill (449.5 - 433.4 Ma)

Environment/lithology: offshore; lithified, cherty/siliceous shale

Size class: macrofossils

Collected by Churkin in 1962

Primary reference: M. Churkin, Jr. and E. E. Brabb. 1965. Ordovician, Silurian, and Devonian biostratigraphy of east-central Alaska. Bulletin of the American Association of Petroleum Geologists 49(2):172-185 [A. Miller/S. Kolbe]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 114845: authorized by Arnold Miller, entered by Sarah Kolbe on 25.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Dimorphograptidae
? Dimorphograptus confertus
 Graptoloidea - Diplograptidae
? Orthograptus sp.
? Orthograptus sp. Lapworth 1873 graptolite
 Graptoloidea - Climacograptidae
Climacograptus cf. hughesi, Climacograptus sp., Climacograptus cf. scalaris
Climacograptus sp. Hall 1865 climacograptid
Climacograptus cf. scalaris Lapworth 1877 climacograptid
var. normalis