R - Reid, Thomas to Rhynie chert
Reid, Thomas philosopher;
b 26 April 1710 Strachan Kincardine; d 1796
1733-6 Librarian at Marischal College; 1751 Regent at Kings College, later Professor of Philosophy; 1764 Professor of Moral Philosophy at Glasgow University
Rhynie chert n
A siliceous rock from Rhynie, Aberdeenshire containing fossils of some of the earliest land plants.
Rhynie is one of the most important palaeontological sites in Britain on account of the occurrence of very early land plants and arthropods. The primitive plants found in the Rhynie chert lived about 400 million years ago around the edge of hot springs and geysers which occasionally drowned the plants with hot silica-rich water. This preserved the cell structure plants, and microscopic examination of the rock shows remains of some of the earliest known spiders that lived among the plants.