Coprolites are the fossilised remains of fecal matter from animals, classified as trace fossils, they are not sought after for knowing the animals appearance, but rather an insight into the animals behavior, in this case, their diet. The name is derived from the Greek words 'Korpos' which, coincidentally, means dung and 'Lithos' meaning stone. Like most fossils, the main constituents which made up the coprolite have been replaced by minerals, leaving little more than a small pebble to an odd shaped and textured stone behind. These particular specimens are of fish coprolites, they are Permian in age, making them around 275 million years old and are found within a slate marl matrix. They come fromFerry Hill, Durham, UK and come supplied in a packet with an information label. Ideal for serious fossil collectors or within educational establishments, the actual fecal matter is only a few millimeters in length, while the matrix varies from sample to sample between 30 to 50 mm.