Shadow Lake Formation

Shadow Lake formation
Stratigraphic range: Middle Ordovician
TypeGeological formation
Unit ofBlack River & Simcoe Groups
UnderliesGull River Formation
OverliesGrenville basement
Loysburg Formation
Thickness0–10 m (0–33 ft)
Lithology
PrimarySandstone, conglomerate
OtherSiltstone, shale
Location
RegionOntario, Pennsylvania
CountryCanada, United States
Type section
Named forShadow Lake
Named byLiberty
Year defined1969

The Shadow Lake formation is a geological unit that crops out in Southern Ontario, Canada and northern Pennsylvania, United States. The shaly sections act as a caprock to petroleum reservoirs.

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