Aberystwyth Grit Formation
Quick Summary
The Aberystwyth Grit Formation is a geological deposit found in Wales, United Kingdom, specifically within the county of Ceredigion. This formation accumulated in deeper-water environments during the Silurian Period.12
The Aberystwyth Grit is significant for its association with graptolites, which are small, colonial, planktonic animals that secreted an exoskeleton preserved as a carbon film in shales. These graptolites are excellent index fossils because they evolved rapidly and were widely distributed, allowing geologists to correlate rock strata globally. The presence of graptolites in the Aberystwyth Grit Formation helps in precisely dating these Silurian rocks, often within limits of one million years or less.1
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