Which of the following was charles lyell's contribution?
he developed the theory of natural selection.
he formalized many principles of geology.
he organized a hierarchical classification of organisms.
he developed the principle of biological succession.

He formalized many principles of geology. Charles Lyell was a famous geologist of his era. One of his important works was the book Principles of Geology, an exploration of James Hutton's uniformitarianism doctrine. He also supported Darwin's theory of natural selection.