|Site of Special Scientific Interest|
|Area of Search||Avon|
|Area||0.5 hectares (0.0050 km2; 0.0019 sq mi)|
|Natural England website|
This is the site of old mine workings on the Somerset coalfield, including 3,000 tons of Upper Carboniferous spoil from which more than 1,400 insect fossil specimens have been recovered, including the world's earliest known Damselfly. It is a Geological Conservation Review Site, because it has yielded the largest ever collection of Carboniferous insects in Britain. The commonest forms belong to the order Blattodea (cockroaches) and include the extinct families Archimylacris and Mymarommatidae. Protorthoptera and Palaeodictyoptera also occur. Frequent chelicerates (arthropods) include trace and body fossils of xiphosurid merostomes and arachnids, including Phalangiotarbi and Trigonotarbida and also true spiders (Araneida). Rare myriapods (millipedes) and occasional conchostracan crustaceans (clam-shrimps) also occur.
- "Decay and Disarticulation of the Cockroach: Implications for Preservation of the Blattoids of Writhlington (Upper Carboniferous), UK". PALAIOS; June 2003; v. 18; no. 3; p. 256-265;. Retrieved 2006-11-14.
- English Nature citation sheet for the site (accessed 17 July 2006)