File:Grallator gracilis (dinosaur footprint) (Portland Arkose, Lower Jurassic; Rocky Hill, Connecticut, USA) (42215374551).jpg

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Grallator gracilis (Hitchcock, 1837) - dinosaur footprint from the Jurassic of Connecticut, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

The dinosaur that produced the footprint shown above was a theropod, a group of medium-sized to very large, bipedal, carnivorous (predatory) dinosaurs.

The reddish-brown matrix is ferruginous siliciclastic sedimentary rock - it appears to be hematitic, micaceous sandstone. The sample is from the Newark Supergroup, a thick, geographically-widespread stratigraphic unit in eastern USA. It is Late Triassic to Early Jurassic in age and represents sediments and some lava flows that filled up old rift valleys that roughly parallel the Eastern Seaboard of America. The rift basins formed in the Triassic when the ancient Pangaea supercontinent attempted to break apart, but failed. A successful breakup of Pangaea occurred during the Jurassic. Most of the basin-filling rocks are terrestrial redbeds - hematite-rich siliciclastic sedimentary rocks, such as conglomerate, sandstone, siltstone, and shale, deposited in nonmarine environments.

Stratigraphy: Portland Arkose, Newark Supergroup, Lower Jurassic

Locality: unrecorded/undisclosed site at or near Rocky Hill, Connecticut, USA

For more info., see: <a href="https://en.wikipedia.org/wiki/Grallator" rel="nofollow">en.wikipedia.org/wiki/Grallator</a> and

<a href="https://en.wikipedia.org/wiki/Newark_Supergroup" rel="nofollow">en.wikipedia.org/wiki/Newark_Supergroup</a>
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Source Grallator gracilis (dinosaur footprint) (Portland Arkose, Lower Jurassic; Rocky Hill, Connecticut, USA)
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/42215374551 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current04:03, 6 December 2019Thumbnail for version as of 04:03, 6 December 20192,083 × 2,406 (4.31 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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