Cheney, T.M. <br/><br/>
Sechura phosphate deposits, their stratigraphy, origin and composition 

 - Lancaster, PA  Society of Economic Geologists  March-April 1979 
 - pp. 232-259  ilus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COMPOSICION QUIMICA<br/>DIATOMITA<br/>ESTRATIGRAFÍA<br/>FOSFATOS<br/>GENESIS-YACIMIENTO<br/>LITOESTRATIGRAFIA<br/>PETROGRAFÍA
<br/><br/><label>Subjects--Geographic Terms: </label><br/>PERU<br/>PIURA<br/>SECHURA