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单词 Unio bed
释义

Definition of Unio bed in English:

Unio bed

noun
  • A layer of rock rich in fossilized shells of freshwater mussels; specifically that in the lower part of the upper strata of the Purbeck beds in Dorset;.

Origin

Mid 19th century; earliest use found in Quarterly Journal of the Geological Society of London.

Definition of Unio bed in US English:

Unio bed

noun
  • A layer of rock rich in fossilized shells of freshwater mussels; specifically that in the lower part of the upper strata of the Purbeck beds in Dorset;.

Origin

Mid 19th century; earliest use found in Quarterly Journal of the Geological Society of London.

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