A broken tooth from the Orthacodus family, an extinct group of sharks, has been found at CEMEX Barrington Quarry, near Cambridge. This important find is a ‘first’ in UK or Europe in an area where rocks date back to the Jurassic, Cretaceous and early Tertiary age that is, over 55million years ago.
Orthacodus, also known as Sphenodus, first appeared 200 million years ago and lived just after the dinosaurs, outliving them by 10 million years. They appear to prefer cool waters and so lived in the northern and southern oceans. Current evidence shows they existed in the areas near Peterborough and on the Dorset coast and now, Cambridge Greensand where Barrington Quarry is situated.
Although only teeth have been found to date, it is thought to be similar to a six-gilled shark.
Cambridge Greensand was part of the seabed 90 – 100 million years ago and is a deposit of silty green chalk with phosphate nodules restricted to the Cambridge area. In the mid 19th century the area was actively quarried for the nodules which were used to make agricultural fertilizer and the green mineral, glauconite, from which the greensand gets its name, was used to dye military uniforms a khaki colour.
The tooth is currently being studied by David Ward, a retired Veterinary Surgeon who is interested in fossil sharks and it will be housed by the Natural History Museum in London.
Notes to editors:
- CEMEX is a global building materials company that provides high-quality products and reliable service to customers and communities in more than 50 countries throughout the world
- In the UK, as well as ready mixed concrete, cement and aggregates, CEMEX also produces asphalt, and has a significant share of the roof tile, rail sleepers, concrete-block paving, and concrete-block segments. CEMEX has a national supply network in the UK to ensure that quality building materials are available to customers locally. For more information, see www.CEMEX.co.uk or www.CEMEX.com