ABSTRACTS OF PAPERS 225 



which yielded Agassazia clevei Cotteau may be a stage of the Bowden (Mio- 

 cene) of Jamaica. The presence of certain forms which are reported from 

 Costa Rica and Panama show that an intimate relation exists also with these 

 Tertiary horizons. 



STRATIGRAPHY AXD PALEONTOLOGY OF THE 8ALINA8 AND MONTEREY 

 Q UA DRANGLE8, CALIF OR NIA 



BY H. J. HAWLEY 



(Abstract) 



The Salinas and Monterey quadrangles eo\ er the northern part of Monterey 

 County, California, and include the northern termination of the Santa Lucia 

 Range, a small part of the broad alluvial plain of the Salinas Valley, and a 

 small part of the western slope of the Gabilan Range. 



The basement complex of gneisses, schists, granite, and crystalline limestone, 

 on whicli all of the younger sedimentary formations were deposited after a 

 long period of erosion, is of doubtful age. 



The oldest sedimentary rocks exposed within these quadrangles are a series 

 named by Lawson the "Carmelo Series," consisting of 1,320 feet of conglom- 

 erate interbedded with blue and brown sandstones and clay shales. These 

 strata are unfossiliferous and their age placed as Chico because of the marked 

 lithological resemblance to the Chico of the Santa Cruz quadrangle. Their 

 relation to the Monterey shale is masked by intrusion of lava and by the over- 

 lying mantle of Paso Robles. 



The oldest definitely known sedimentary formation is the Temblor sandstone, 

 made up of 2,300 feet of red, blue, and green concretionary sandstone, which 

 contains numerous forms of Pecten andersoni, Turritella ocoijana, and Aga- 

 soma harkerianum. Conformably overlying this sandstone is the typical silice- 

 ous diatomaceous Monterej' shale, with a thickness of 3,500 feet. In the Corral 

 de Tierra this shale is represented by a near-shore sandy phase. Many well 

 preserved forms of Area fnontcreyana, Pecten discus, Yoldia impressa, and 

 Peeten peelchami characterize this horizon. The Santa Margarita formation, 

 of a thickness of 1,400 feet of white, coarse calcareous sandstone, with lenses 

 of siliceous limestone and brown micaceous sandstones, overlies the Monterey 

 shale with no angular unconformity, but the presence of pholas borings indi- 

 cate a time lapse. From these sandstones specimens of Pecten estrellaniis and 

 Ostrea titan were collected in great number. This upper micaceous sandstone 

 is conformable with the overlying Paso Robles formation. This unfossiliferous 

 formation was correlated with the Paso Robles of the San T.uis quadrangle 

 and the Salinas A'alley on a purely lithologic basis. It consists of a very 

 coarse, unsorted, loosely consolidated conglomerate in the steep mountains, 

 passing gradually into a light In-own to yellow fine-grained concretionary sand- 

 stone in the northern part of the Monterey (juadrangle. 



A flow of basic la^'a exposed in small patches about the mouth of the Carmel 

 River poured out after the deposition of the Monterey and before the Paso 

 Robles was Mid down. 



