Boyd local fauna (Cretaceous of the United States)

Where: Wise County, Texas (33.1° N, 97.5° W: paleocoordinates 30.7° N, 55.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Glen Rose Limestone Formation (Trinity Group), Early/Lower Albian (112.0 - 109.0 Ma)

• The Glen Rose formation spans through four ammonite zones with ages between latest Aptian and early Albian. Young 1974 suggested the Kasanskyella spathi ammonite zone is latest aptian, the Hypacanthoplites cragini zone is earliest Albian, the Douvilleiceras mammillatum and Hypacanthoplites comalensis zones are early Albian and may extend into the middle Albian. The Salenia texana Zone and Corbula bed fall within the mammillatum zone. The benthic foraminifera Orbitolina texana also suggests a late aptian - early albian age and is found in basal levels and in the upper member (Stricklin et al. 1971). Scott et al. (2007) estimated that the age of the Glen Rose Formation ranges from 113.3 to 108.0 Ma.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: mesofossils

Primary reference: J. T. Thurmond. 1971. Cartilaginous fishes of the Trinity Group and related rocks (Lower Cretaceous) of north central Texas. Southeastern Geology 13:207-227 [M. Carrano/M. Carrano/M. Oreska]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 99156: authorized by Matthew Carrano, entered by Matthew Oreska on 29.10.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodus sp. Agassiz 1834 elasmobranch
 Rajiformes -
"Hypolophus mcnultyi" = Pseudohypolophus mcnultyi
"Hypolophus mcnultyi" = Pseudohypolophus mcnultyi Thurmond 1971 guitarfish