Thomas Henry Huxley; A Sketch Of His Life And Work
Chapter 5
CREATURES OF THE PAST 67
Beginning Palæontological Work--Fossil Amphibia and Reptilia--Ancestry of Birds--Ancestry of the Horse--Imperfect European Series Completed by Marsh's American Fossils--Meaning of Geological Contemporaneity--Uniformitarianism and Catastrophism Compared with Evolution in Geology--Age of the Earth--Intermediate and Linear Types.