[1] In a more restricted sense, the term is used to describe certain thin layers of bony fragments, which occur in well-defined geological strata.
Although quite thin, the Ludlow Bone Bed can be followed from that town into Gloucestershire, for a distance of 45 miles (72 km).
Another well-known bed, formerly known as the Bristol or Lias Bone Bed, exists in the form of several thin layers of micaceous sandstone, with the remains of fish and saurians, which occur in the Rhaetic Black Paper Shales that lie above the Keuper marls, in the south-west of England.
[2][3] A bone bed has also been observed at the base of the Carboniferous limestone series, in certain parts of the south-west of England.
Two of the best examples include the Mixson's Bone Bed of Florida, whose geological settings preserved the remains of Ambelodon, Aepycamelus, and Cormohipparion,[24] and the Agate Fossil Beds in Nebraska which has the fossils of abundant creatures such as Menoceras, Stenomylus, and Daphoenodon.