Portland Formation

Portland Formation
Stratigraphic range: Hettangian - Sinemurian, 199–195 Ma
↓
Type Geological formation
Unit of Newark Group
Sub-units Deerfield Basin, Turners Falls Sandstone & Mount Toby Formation
Lithology
Other Mudstone, Sandstone, Siltstone, Limestone
Location
Region North America
Country  USA

The Portland Formation is a geological formation in the northeastern United States. It dates back to the Early Jurassic period.[1] The formation consists mainly of sandstone laid down by a series of lakes (in the older half of the formation) and the floodplain of a river (in the younger half). The sedimentary rock layers representing the entire Portland Formation are over 4 kilometres (2.5 mi) thick and were formed over about 4 million years of time, from the Hettangian age (lower half) to the late Hettangian and Sinemurian ages (upper half).[2]

Vertebrate fauna

Dinosaur coprolites located in Massachusetts, USA.[1] Ornithischian tracks located in Massachusetts and Connecticut, USA.[1] Theropod tracks located in Massachusetts and Connecticut, USA.[1] Prosauropod tracks located in Massachusetts and Connecticut, USA.[1]

Dinosaurs reported from the Portland Formation
Genus Species Location Stratigraphic position Material Notes Images
Anchisaurus[1]

A. polyzelus[1]
  • Connecticut[1]
  • Massachusetts[1]
Anchisaurus

Podokesaurus[1]

P. holyokensis
  • Connecticut[1]

Partial postcranial skeleton.[3]

All known remains of this species have been destroyed.

See also

Footnotes

  1. 1 2 3 4 5 6 7 8 9 10 11 Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Jurassic, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 530–532. ISBN 0-520-24209-2.
  2. ↑ Olsen, P.E. (2002). STRATIGRAPHY AND AGE OF THE EARLY JURASSIC PORTLAND FORMATION OF CONNECTICUT AND MASSACHUSETTS: A CONTRIBUTION TO THE TIME SCALE OF THE EARLY JURASSIC. Session No. 26 Studies of Depositional Systems and Sedimentary Rocks: In Honor of Edward Scudder Belt. 37th Annual Meeting (March 25-27, 2002).
  3. ↑ "Table 3.1," in Weishampel, et al. (2004). Page 48.

References

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