Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock. Rhacolepis Buccalis were an extinct form of boney fish. They are one of the few species that have provided palaeontologists with whole fossilised heart specimens, which has aided in the research of the evolution of the heart. The Santana Formation is famous for producing fine fossil specimens and examples of Rhacolepis Buccalii were readily available. They are however now known only through old collections.
Fossilised Rhacolepis Buccalis Specimen
A fossilised Rhacolepis Buccalis fish specimen, from the Santana Formation in Brazil. The fossil, which is embedded in an oval stone matrix, is delicately curved and displays well -preserved details . The rhomboid scale structure is clearly evident on the fish’s body and there are faint indications of a fin. The head presents a slightly darker colour than the rest of the body, whose shape tapers to the end, where no apparent caudal fin is observed but with several brown thin bone-like structures showing.
Period: Cretaceous Period
Provenance: From a Surrey gentleman's collection (DG), purchased on the London Art Market from an ADA member, formed 1990's onward.
Condition: Good condition. Some hairline cracks to the stone matrix.