Show fossils reveal history the fossil shells of the cheery lie ery in uberte arte brates hr illes or s t creatures are of prent great importance Ini to 10 geologists for they indicate ahe geologic period lu which the rock beds conla tiling them ware vre formed in other worda HIP file age of the rock each ruek rock lied hed contains forms or groups sl of forms that determine tile th period in which t mud or sand former elrett pl rett to ot of the baltad states e go geological suney once tersely ex fila pl alneil ined to a congressional committee the nine of 0 paleontology ontology by sailing MI lug that it Is 11 the hie geologists clock by lie he tells the time in the worlds history when any rock led was us formed lor nied |