Beecher's Trilobite Bed is a Konservat-Lagerstätte of Late Ordovician (Caradoc) age located within the Frankfort Shale in Cleveland's Glen, Oneida County, New York, USA.^[2] Only 3-4 centimeters thick, Beecher's Trilobite Bed has yielded numerous exceptionally preserved trilobites with the ventral anatomy and soft tissue intact, the soft tissue preserved by pyrite replacement.^[2][3] Pyritisation allows the use of X-rays to study fine detail of preserved soft body parts still within the host rock.^[4][5] Pyrite replacement of soft tissue is unusual in the fossil record;^[6] the only Lagerstätten thought to show such preservation were Beecher's Trilobite Bed, the Devonian Hunsrück Slates of Germany, and the Jurassic beds of La Voulte-sur-Rhône in France,^[7] although new locations are coming to light in New York state.^[8]

• http://en.wikipedia.org/wiki/Beecher's Trilobite Bed