Collection 141. 3/8ths mile south west of 2.5 miles N60°W of Pena Blanca Spring (Ordovician of the United States)

Where: Texas (29.4° N, 98.7° W: paleocoordinates 23.1° S, 83.7° W)

When: Isograptus caduceus graptolite zone, Fort Peña Formation, Whiterockian (470.0 - 457.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; black, cherty/siliceous shale and limestone

• The formation consists of purple chert in layers 2 to 6 inches thick, black shale in layers 4 to 24 inches thick, brown-weathering, thin-bedded, generally cross-laminated, gray limestone in layers 4 to 18 inches thick containing orange-weathering chert stringers one-quarter to three-quarters inch thick, calcareous subgraywacke in layers 4 to 17 inches thick, and limestone and chert-pebble conglomerate in layers 3 to 10 inches thick

Size class: macrofossils

Primary reference: W. B. N. Berry. 1960. Graptolite Faunas of the Marathon Region, West Texas. University of Texas Publication 6005:1-179 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 210164: authorized by Pete Wagner, entered by Pete Wagner on 24.05.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

 Graptoloidea - Isograptidae
"Isograptus caduceus" = Parisograptus caduceus Salter and Bigby 1853 graptolite
Isograptus caduceus divergens
Isograptus victoriae Harris 1933 graptolite
Isograptus caduceus var. victoriae
"Isograptus maximodivergens" = Isograptus victoriae maximodivergens Harris 1933 graptolite
Isograptus caduceus var. maximo-divergens
Cardiograptus morsus Harris and Keble 1916 graptolite
 Graptoloidea - Dichograptidae
Oncograptus biangulatus graptolite
Oncograptus upsilon biangulatus
Oncograptus upsilon Hall 1914 graptolite
Didymograptus paraindentus Berry 1960 graptolite
 Graptoloidea - Phyllograptidae
 Graptoloidea - Pterograptidae
"Didymograptus vdeflexus" = Yutagraptus vdeflexus
"Didymograptus vdeflexus" = Yutagraptus vdeflexus Harris 1924 graptolite
Didymograptus v-deflexus