A chonolith is an igneous rock intrusion of irregular shape. A chonolith has a demonstrable base, which is absent in other types of irregularly-shaped intrusions (batholiths, stocks and bosses). Examples are: ... Found on http://en.wikipedia.org/wiki/Chonolith
1) Igneous rock 
A chonolith is an igneous rock intrusion of irregular shape. A chonolith has a demonstrable base, which is absent in other types of irregularly-shaped intrusions (batholiths, stocks and bosses). Examples are: ...