West shore of San Fernando Island, collection USGS M1140 - SD (Silurian of the United States)

Where: Alaska (55.5° N, 133.3° W: paleocoordinates 3.0° S, 95.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Monograptus convolutus zone, Descon Formation, Llandovery (443.4 - 433.4 Ma)

• Middle Llandovery

• formation-level stratigraphic resolution

Environment/lithology: offshore; cherty/siliceous shale

• cherty shale with graptolite rich shale partings; thick graywacke interbeds

Size classes: mesofossils, microfossils

Primary reference: M. Churkin, Jr. and C. Carter. 1970. Early Silurian Graptolites from Southeastern Alaska and their correlation with graptolitic sequences in North America and the Arctic. United States Geological Survey Professional Paper 653:1-51 [W. Kiessling/M. Krause/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 145592: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 06.06.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Climacograptidae
Pseudoclimacograptus (Metaclimacograptus) cf. undulatus, Climacograptus stenotelus
Climacograptus stenotelus climacograptid
common specimens
 Graptoloidea - Diplograptidae
Orthograptus insectiformis
Orthograptus insectiformis graptolite
rare specimens
 Graptoloidea - Monograptidae
Rastrites aff. peregrinus, Monograptus buddingtoni, Monograptus cf. crenularis, Monograptus undulatus
Rastrites aff. peregrinus graptolite
frequent specimens
Monograptus buddingtoni graptolite
frequent specimens
Monograptus cf. crenularis graptolite
abundant specimens
Monograptus undulatus graptolite
frequent specimens
 Graptoloidea - Retiolitidae
"Petalograptus palmeus" = Petalolithus, Glyptograptus cf. tamariscus
"Petalograptus palmeus" = Petalolithus graptolite
frequent specimens
Glyptograptus cf. tamariscus Nicholson 1868 graptolite
frequent specimens