Geological formation in Connecticut and Massachusetts
Not to be confused with Portland Group (geology) or Portland stone.
Portland Formation
Stratigraphic range: Hettangian-Sinemurian ~199–195 Ma
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Type
Geological formation
Unit of
Agawam Group, Newark Supergroup
Sub-units
Turners Falls Sandstone & Mount Toby Formation
Overlies
East Berlin Formation
Lithology
Primary
Sandstone
Other
Mudstone, siltstone, limestone
Location
Coordinates
42°18′N72°30′W / 42.3°N 72.5°W / 42.3; -72.5
Approximate paleocoordinates
24°00′N18°36′W / 24.0°N 18.6°W / 24.0; -18.6
Region
Connecticut, Massachusetts
Country
USA
Extent
Deerfield & Hartford Basins
Portland Formation (the United States)
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Portland Formation (Massachusetts)
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The Portland Formation is a geological formation in Connecticut and Massachusetts in the northeastern United States.[1] It dates back to the Early Jurassic period.[2] 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).[3]
In 2016, the paleontologist Robert E. Weems and colleagues suggested the Portland Formation should be elevated to a geological group within the Newark Supergroup (as the Portland Group), and thereby replacing the former name "Agawam Group". They also reinstated the Longmeadow Sandstone as a formation (within the uppermost Portland Group); it had earlier been considered identical to the Portland Formation.[4]
^Portland Formation - USGS
^Weishampel et al., 2004, pp.530–532
^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". Geological Society of America (Abstract). Archived from the original on 2018-11-28. Retrieved 2017-07-07.
^Weems, R. E.; Tanner, L. H.; Lucas, S. G. (2016). "Synthesis and revision of the lithostratigraphic groups and formations in the Upper Permian?–Lower Jurassic Newark Supergroup of eastern North America". Stratigraphy. 13 (2): 111–153.
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