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).
Chondrichthyes; class Chondrichthyes. Hypernyms (Chondrichthyes is a kind of...): class ((biology) a taxonomic group containing one or more orders) Meronyms (members of Chondrichthyes): cartilaginous fish; chondrichthian (fishes in which the skeleton may be calcified but not ossified) Holocephali; subclass Holocephali (chimaeras and extinct forms) Elasmobranchii; Selachii; subclass Elasmobranchii; subclass Selachii (sharks; rays; dogfishes; skates) Holonyms (Chondrichthyes is a member of...):