STUDIES IN GEOLOGY, No. 3 



Ton. 



Connoiba// 



conglomerolrs, jand*to oca , local'i^ CaJcarfoos 

 Posi li -Ttrous, locoltu loose or>6 -O-ioble. Color 



Gnren clo<(, 'ocoll^ ryd, #-cf, purplish 



shol, ofttn frpi.ftroos, TYtathrs a-m/'a/- t 



Ouster 



Pst)T 



Hrortf bds of jbbls,wi*J 8and<^ and argillaceous 

 intrbeddd with Variegated cla</s and loos, ^r,' 



Green clocj. /ocal'(f "d, ^*<f> purplish 



Hrarj bddd iiflht Bellow sandstone w.'t*> shl(j inter 

 calations. Usually ptbbl^ and looo Ilij conjlomeratic. 

 f'rf^atotlij rd Or rostij from irrt *tain5 . 

 yerif calcareous and -Posjiliferoas . 



Thinner bddffd li^ht colored Sands1on5 with abundant 

 ntrcalation3 of jracj To yellow, sand^ Jhal*5 some of 

 Which are farbencieo</4 and contain planT fragments. 



dorfe gre( shales, vitK corbonat nodol, 

 dork brown loo$ claj fvi'ttj tnuch selcnile 



Interbcdded drk freij shales, 1/Jht |re^ t <je)low,sh 

 5hals, and rh''r> b<>5 of loose Sand. 



, one inch =. 5O'. 

 Fig. I. Section of the Tertiary of the Zorritos district. 



