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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 |
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