1.   ...North American fossil specimens.

2.   As curator of reptile fossils, he spent much of his time doing scientific research, preparing fossil specimens for the public and organizing exhibitions.

3.   As the inner ears of more fossil specimens are examined with the scanners, he said, a more precise phylogenetic picture of early hominids should emerge.

4.   Instead of being arranged in chronological progression, from earliest to latest, the fossil specimens are placed so that visitors can walk along the evolutionary tree of dinosaurs.

5.   There was little erosion of the soil because it was well-protected against civilisation and this must have made it rich in fossil specimens.