| Sub-Type | Other Marine |
|---|---|
| Type | Fossils |
| Shape | Natural |
| Finish | Polished |
| Country of Origin | United Kingdom |
Check the listing for details. cotham marble, stromatolite, landscape stone, polished, upper Triassic, CM4. Condition: New, Made in United Kingdom. Listed at 32.53 USD. Cotham Marble or Landscape marble is a variety of Rhaetian (uppermost Triassic) limestone from the Penarth Group, found in South Wales and Southwest England .205 Million Years Old. These structures in the Marble have been debated and ascribed to a number of causes. Modern science has confirmed these are organic in origin caused by algae secreting minerals and capturing sediment particles to create dome like structures and form picture like patterns which show up in cross section. These algae were alive just before the incursion of the Jurassic seas covering these areas. This specimen is 11.5 cms across and is polished at one side , comes with a free display stand
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