Otter Sandstone Formation

The Otter Sandstone Formation is an obsolete geological unit in England, now referred to as the Helsby Sandstone Formation.^[2] It preserves fossils dated to the Triassic, Anisian period.

Otter Sandstone Formation (OS)[1]
Stratigraphic range: Anisian
Exposures of Otter Sandstone at Ladram Bay, Devon, England
Type	Formation
Unit of	Sherwood Sandstone Group (SSG)[1]
Underlies	In coastal exposures, transitional into overlying Mercia Mudstone.[1]
Overlies	Budleigh Salterton Pebble Beds[1]
Thickness	Coast and Exeter district: ~160 m (520 ft) Taunton district: 30–60 m (98–197 ft)
Location
Region	England
Country	United Kingdom

See also

• List of fossiliferous stratigraphic units in England