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.

See also

References

  1. ^ a b c d http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=OS (BGS on-line lexicon of rock units)
  2. ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HEY (BGS on-line lexicon of rock units)


Allikas: https://en.wikipedia.org/wiki/Otter_Sandstone_Formation
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