The Portland stone was formed around 150 million years ago in the Late Jurassic period. It is a fine-grained. massive limestone, which was originally deposited in a calm shallow sea. Nodules of chert a hard flint like substance of almost pure silica help fortify the rock further. The rocks contain ammonite fossils.
Added:
7th Dec 2005 by Diane Earl
Subjects:
Geography, Science
Key Stages:
Key Stage 2, Key Stage 3, Key Stage 4, Key Stage 4+
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Picture 1 of 12 -Lulworth Types of Rock Portland Stone
