Igneous Intrusions. Igneous intrusions form when magma cools and solidifies before it reaches the surface. Three common types of intrusion are sills, dykes, and batholiths (see image below). form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock.The Whin Sill (top left image) in N. England provided a defensive cliff-line on which the Romans built Hadrianâs Wall.form as magma pushes up towards the surface through cracks in the rock.orm when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock. The Whin Sill (top left image) in N. England provided a defensive cliff-line on which the Romans built Hadrianâs Wall. form as magma pushes up towards the surface through cracks in the rock.
The scientific name for the phylum of cartilaginous fishes is Chondricthyes. More specifically, sharks are categorized under subclass Elasmobranchii which is then divided into â¦ the subdivisions Selachii (sharks) and Batoidea (skates and rays).
The African Butterflyfish Pantodon buchholzi is a unique and fascinating freshwater fish from Africa. It is also known as the Freshwater Butterflyfish. The Butterfly fish was Introduced to European aquarists in 1905 and is the only member of its species, and its family. Butterfly fish has a flat head and back that is a light brown or greenish color with a silver sheen and has dark markings on the fins and underside. The large pectoral fins of the Freshwater Butterflyfish are widespread and it uses them to glide over short distances.