Malone Mountains and outlying foothills, Upper Malone Formation (Cretaceous of the United States)

Where: Texas (31.2° N, 105.6° W: paleocoordinates 28.1° N, 56.0° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Upper Member (Malone Formation), Early/Lower Berriasian (145.0 - 140.2 Ma)

• "Malone formation... the formation consits of two divisions. The upper division (330 ft) is composed dominantly of impure limestones... [Fauna] fixing the age of the upper division as upper Portlandian." (according to Sey and Kachaleva 1999 Upper Volgian (Upper Portlandian) = Lower Berriasian)

• member-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified, fine-grained limestone

• Classification based on the following description: "...the lower and upper members of the Malone Formation are raised to formation status and called the Broadtop Hill Formation and Cedar Canyon Formation, respectively, in order to reflect their true lithologic character. The Cedar Canyon Formation consists of mudstones and wackestones deposited in a brackish lagoonal environment. Both marine and freshwater algae are the predominant fossil types." cited from B. Tickner (2005). Stratigraphic studies and microfacies analysis of the Jurassic succession, Malone Mountains, west Texas.

Size class: macrofossils

Collection methods: collected in the summers of 1934 and 1935

Primary reference: C. C. Albritton. 1937. Faunal diversity in Malone Mountains beds, Texas. Pan-American Geologist 68(4):257-262 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 69011: authorized by Martin Aberhan, entered by Sabine Nürnberg on 15.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• "The lists of fossils are not complete for any of the three formations. The particular species entered are chosen either because their age has been subject of controversy, or, because they are important in the dating of formations, or, because they are unusually abundant in their respective formations."
Show authors, comments, and common names
Bivalvia
 Ostreida - Gryphaeidae
Exogyra potosina
Cephalopoda
 Ammonitida - Neocomitidae
Kossmatia aguilerai, Kossmatia zacatecana
Kossmatia zacatecana Burckhardt 1912 ammonite