Gwynedd Tunnel (track layers) (Triassic of the United States)

Where: Montgomery County, Pennsylvania (40.2° N, 75.3° W: paleocoordinates 14.7° N, 20.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lockatong Formation (Chatham Group), Norian (228.0 - 208.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; gray, blue claystone

• "the final phase of a flood deposit"
• "a bluish-gray argillite, weathering brown", also described as a "hard grayish shale" and "heavy bedded gray shale, which is hard and will rarely split...The surface of these heavy layers often bears mud-cracks and ripple marks"

Size class: macrofossils

Preservation: mold/impression, trace

Collection methods: quarrying, surface (float), surface (in situ),

Primary reference: W. L. Bryant. 1934. New fishes from the Triassic of Pennsylvania. Proceedings of the American Philosophical Society 73(5):319-326 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 68706: authorized by Matthew Carrano, entered by Matthew Carrano on 02.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
  -
Kintneria brunswickii
Kintneria brunswickii Ryan and Willard 1947 reptile
 Pseudosuchia - Gwyneddichniidae
Gwyneddichnium majore n. gen. n. sp., Gwyneddichnium minore n. sp., Gwyneddichnium elongatum n. sp.
Gwyneddichnium majore n. gen. n. sp. Bock 1952 archosaur
Gwyneddichnium minore n. sp. Bock 1952 archosaur
Gwyneddichnium elongatum n. sp. Bock 1952 archosaur
 Saurischia -
Platypterna lockatong n. sp.
Platypterna lockatong n. sp. Bock 1952 saurischian
 Theropoda - Grallatoridae
Anchisauripus gwyneddensis n. sp.
Anchisauripus gwyneddensis n. sp. Bock 1952 theropod