307.5 ft. above base (Cambrian of the United States)

Where: McCulloch County, Texas (31.0° N, 99.3° W: paleocoordinates 17.5° S, 95.2° W)

When: Saukia trilobite zone, San Saba Member (Wilberns Formation), Trempealeauan (492.5 - 485.4 Ma)

• bed number is feet above base. Highly variable, has calcitic facies (North) and Dolomitic facies (South)

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal; lithified, medium-grained, dolomitic, glauconitic, ooidal, shelly/skeletal, silty, sandy limestone

• Interval 300-330ft: Limestone - microgranular to fine grained to coarser, some beds very glauconitic, others nonglauconitic; from 305 to 310 feet, some very fine sand, mostly detrital feldspar with authigenic overgrowths, some quartz; slight silty, similar in composition to sand; beds mostly 1 to 12 inches thick

•Bed: medium grained, oolitic in upper part, coarse glauconite common, mottle by minute specks of pale yellowish gray-orange dolomite, bedding indistinct, weathers smooth

Size class: macrofossils

Primary reference: V. E. Barnes and W. C. Bell. 1977. The Moore Hollow Group of Central Texas. Report of Investigation (88)1-169 [M. Patzkowsky/K. Irizarry/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 216018: authorized by Mark Patzkowsky, entered by Kayla Irizarry on 02.12.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Helcionelloida
 Helcionellida - Coreospiridae
Owenella sp.
Owenella sp. Ulrich and Scofield 1897
Trilobita
 Harpetida - Heterocaryonidae
Bowmania sp.
Bowmania sp. Walcott 1925 trilobite
 Ptychopariida - Catillicephalidae
Triarthropsis sp.
Triarthropsis sp. Ulrich 1931 trilobite
 Ptychopariida - Plethopeltidae
Plethometopus convergens, Leiocoryphe occipitalis
Plethometopus convergens Raymond 1924 trilobite
Raymond
Leiocoryphe occipitalis Rasetti 1944 trilobite
Rasetti
 Asaphida - Ptychaspididae
Idiomesus levisensis, Keithiella scrupulosa, Euptychaspis frontalis
Idiomesus levisensis Rasetti 1944 trilobite
Rasetti
Keithiella scrupulosa trilobite
Ellinwood
Euptychaspis frontalis trilobite
Longacre 1970
 Asaphida - Dikelocephalidae
Dikelocephalus sp., Monocheilus truncatus, Saukiella fallax
Dikelocephalus sp. Owen 1852 trilobite
Monocheilus truncatus trilobite
Ellinwood
Saukiella fallax trilobite
Walcott