Show FOSSIL SHELLS I SHOW ROCKS ROCK'S AGE By fly Special News Service NEW YORK Sept 29 The 29 The fossil shells of the early invertebrates are always of ot great importance to ge geologists geh- geh for they indicate the period In which the rock beds that contain them were formed In formed in other words the age of the tile rock Every rock bed contains contains contains con- con characteristic forms or groups of ot forms that determine the period ii n 11 W which iCh it was mud or sand The econ economic eco eco- n Importance jot geology has been re repeatedly shown In the earlier exploitation of anthracite an coal thousands of dollars were wasted lasted searching for coal beds In New York until the geologist of I Ithe the state showed th that t the beds could coula not contain coal since the fossils I showed that they belonged to the Devonian De n vonian age ago whereas the Pennsylvania anthracite coal beds are of the carboniferous car car- I age a much later period That discovery stopped the useless expenditure I The Tile study of the animal and plant remains that are imbedded in the I rocks has thus become an important part of geology and although the specialists specialists engaged In the study are few their work is of the highest I importance |