Arcola tracksite: Norian, Pennsylvania
collected by Olsen & Banach 1983
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
|
||||||||||
|
Rhynchosauroides hyperbates
Baird 1957
|
||||||||||
|
Reptilia
- Grallatoridae
|
||||||||||
|
Atreipus milfordensis
(Bock 1952)
|
||||||||||
| synonym of Grallator tuberosus | ||||||||||
| YPM 9961 | ||||||||||
|
Reptilia
- Chirotheriidae
|
||||||||||
|
Brachychirotherium eyermani
(Baird 1957)
|
||||||||||
| YPM 9963 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Pennsylvania | County: | Montgomery |
| Coordinates: | 40.2° North, 75.5° West (view map) | ||||
| Paleocoordinates: | 14.7° North, 20.4° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Altitude: | 35 meters | ||||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Late/Upper Triassic |
| Stage: | Norian | 10 m.y. bin: | Triassic 4 |
| Key time interval: | Norian | ||
| Age range of interval: | 227.00000 - 208.50000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | desiccation cracks,wave ripples,planar lamination,bioturbation calcareous "siliciclastic" |
| Includes fossils? | Y |
| Lithology description: "The bed is finely laminated at the base and ripple laminated at the top...there are small calcareous nodules within the oscillation-ripple bedded portion of the bed. This unit is borken by narrow but deep mud cracks...the track-bearing surface is covered by irregular patches of very fine, short wavy lines, which we suggest could be the impression of a filamentous algal scum. Large cylindrical siltstone tubes puncture the surface at irregular intervals." | |
| Environment: | lacustrine - small |
| Glacial or sequence phase: | transgressive |
| Geology comments: The track-bearing surface was covered in shallow water and still supported living trees. It already had several centimeters of lacustrine mud deposited by a recent transgression of what was to become a perennial lake. | |
Taphonomy
| Modes of preservation: | mold/impression,trace |
| Size of fossils: | macrofossils |
| Spatial orientation: | life position |
| Preservation of anatomical detail: | good |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | selective quarrying,surface (in situ),field collection,observed (not collected) | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | YPM | ||
| Collectors: | Olsen & Banach | Collection dates: | 1983 |
Metadata
| Database number: | 55415 | ||
| Authorizer: | M. Carrano | Enterer: | K. Maguire |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2005-10-20 12:29:16 | Last modified: | 2023-06-14 15:48:22 |
| Access level: | the public | Released: | 2005-10-20 12:29:16 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 14907. | ETE | P. E. Olsen and D. Baird. 1986. The ichnogenus Atreipus and its significance for Triassic biostratigraphy. In: K. Padian (ed.), The Beginning of the Age of Dinosaurs: Faunal Changes Across the Triassic-Jurassic Boundary. Cambridge University Press, Cambridge 61-87 [M. Carrano/K. Maguire/M. Carrano] |
Secondary references:
| 15573 | ETE | P. E. Olsen and J. J. Flynn. 1989. Field guide to the vertebrate paleontology of Late Triassic age rocks in the southwestern Newark Basin (Newark Supergroup, New Jersey and Pennsylvania). The Mosasaur 4:1-43 [M. Carrano/K. Maguire/M. Carrano] |
| 85047 | D. B. Weishampel and L. Young. 1996. Dinosaurs of the East Coast xiii-275 [M. Carrano/M. Carrano] |