Freeman Clark Quarry, Fair Haven (Triassic of the United States)

Also known as Stegomus arcuatus holotype site

Where: New Haven County, Connecticut (41.3° N, 72.9° W: paleocoordinates 17.4° N, 18.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: New Haven Formation (Chatham Group), Alaunian (215.6 - 212.0 Ma)

• Middle part of the formation, of nid-Norian age. The basal portion of the New Haven Formation has yielded a palynoflorule dated as latest Carnian to early Norian. The upper part of the formation has yielded the procolophonid Hypsognathus and a sphenodontid (cf. Sigmala) indicative of a latest Triassic (probably Rhaetian) age. U-Pb dating of the lower part of the formation has yielded a date of 211.9 +/- 2.1 Ma, placing it in the Norian stage on recent geological timescales.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; coarse-grained, brown, red sandstone

• "coarse-grained arkose sandstone, reddish brown in color, and showing no bedding planes"

Size class: macrofossils

Preservation: mold/impression

Collected by F. P. Clark in 1895; reposited in the YPM

Collection methods: quarrying, mechanical,

Primary reference: O. C. Marsh. 1896. A new belodont reptile (Stegomus) from the Connecticut river sandstone. American Journal of Science 2:59-62 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 91750: authorized by Matthew Carrano, entered by Matthew Carrano on 19.10.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Pseudosuchia - Stagonolepididae
Stegomus arcuatus n. gen. n. sp.
Stegomus arcuatus n. gen. n. sp. Marsh 1896 aetosaur
YPM 1647, natural cast of the ventral aspect of part of the dorsal carapace