By this I mean that some of the classic cases of Darwinian change in the fossil record , such as the evolution of the horse in North America , have had to be discarded or modified as a result of more detailed information ..what appeared to be nice simple progression when relatively few data were available now appears to be much more complex and much less gradualistic .
Dr David Raup , Curator of Geology in Chicago , Field Museum of Natural History Bulletin , Vol 50 No 12 , January 1979 , page 25 .
Comments added : Darwin stated there was no such evidence to support a finely graduated organic chain , which is required by biological evolution . So , if there is less examples of evolutionary transition now , than there was when there was non , that means there is less than non now . So , actually , the evidence for biological evolution over millions of years has now gone into the negative evidence range ...STILL ACCEPT SLOW GRADUAL CHANGE ? )
Charles Darwin said :
"Geology assuredly does not reveal any such finely graduated organic chain , and thus , perhaps , is the most obvious and serious objection which can be urged against the theory ."
Charles Darwin , Origin of Species :