WALLALA HKDS. 213 



cate that an uplift, tliough possibly a goiitl(3 one, occiUTed between the 

 Neocomian and the Gault; so that, if it should prove that the Horsetown 

 beds were involved in the nietamorphisni, there were probably two distinct 

 uplifts between the Knoxville and the Wallala, and of these the later must 

 have been much the more violent. This appears less likely than that a 

 single great movement took place at the close of the period characterized 

 by the presence oi Amelia and prior to the Gault. 



The Wallala series. — AloHg thc coast iu Souoma aud Mendocino Counties, 

 from a little below Ft. Ross to beyond the town of Gualala or Wallala,' 

 occurs a series of beds of very considerable thickness, stariding at a high 

 angle and mainly composed of thick-bedded, soft, tawny sandstones ex- 

 ternally similar io those of the Chico group as it is found at New Idria 

 and elsewhere. This series also includes large masses of conglomerate, 

 the pebbles of which are chiefly granite and metamorphic rocks. That 

 these beds lie unconformably upon the metamorphic has already been 

 stated. The Wallala beds are for the most part extremely barren in fossils 

 and no considerable number in any tolerable state of preservation were 

 found excepting at a point on the shore about a mile above the town of 

 Gualala At other points to the southward, however, fragments of Ino- 

 ceramus, easily recognizable by the peculiar structure of the shell, and a 

 few other imperfect fossils were found, so that there could be no doubt as to 

 the faunal continuity of the beds, even had the exposure been less satisfac- 

 tory. 



The National Museum has also received from Mr. C. R. Orcutt, of San 

 Diego, a few fossils from Todos Santos Bay, in Lower California, a part of 

 which Dr. White has determined as identical with those from Mendocino 

 county. He has described the following: 



OoralliocJiama Orcutti (geu. et sp. uov.). 

 Trochus curyostomiis, u. sp. 

 Nerita f. 



' The name of this towu aud of the river which there empties iuto the Pacific is variously spelled 

 Gualala, Guadala, Walhalla, and Wallala. It is of Indian origin, aud the first form is au attempt 

 to convert it into Spanish. The third form is evidently due to the resemblance of the sound to a 

 famons mythological name. The Coast and Geodetic Survey, after careful consideration, have chosen 

 the last spelling, which will no doubt eventually be ndnpti'd on uiaps of the Coast. 



