of the Cuzco Valley, Peru. 73 



tion. West of Fortaleza laminated limestone appears to over- 

 lie conformably the brown Hnayllabamba sandstones ; at two 

 other points a hiatus is indicated by diverse dips and irregular 

 contacts ; and at two localities areas of Huayllabamba strata 

 in normal attitude protrude through the limestone beds. 



Fossils of marine habitat collected at three localities were 

 studied by Dr. T. W. Stanton, of the United States Geological 

 Survey, who submits the following report: 



"I have examined your small collection of fossils from the lime- 

 stones near Cuzco, Peru. The collection is in five lots with dis- 

 tinctive labels but the preliminary examination made it evident 

 that the lots include only one fauna and probably came from a 

 single horizon, as you had determined from the field relations. 

 At least two of the species — a Pecten and a Cucullaea — occur in 

 all five lots, the same naticoid shell in four of them and a Cardita 

 in three. 



It has not been possible to make specific determinations, partly 

 because the fossils are not very well preserved and partly, and 

 more especially, because the collections which have been described 

 from South America are so meager in both number and size, and 

 the localities from which they came are so widely scattered over 

 the continent, that it would be accidental if any of the described 

 forms should be found in a collection from a new locality like this 

 one from Cuzco. The fossils include only echinoids, pelecypods, 

 and gastropods. The entire absence of cephalopods in a collection 

 believed to be of Cretaceous age is noteworthy. The basis of the 

 opinion concerning age may be best indicated by the following 

 briefly annotated list of the forms best recognized. In addition 

 to those listed there are several specimens too imperfectly preserved 

 for even generic identification. 



Diplopodia? sp. A single imperfectly preserved specimen of a 

 regular echinoid doubtfully referred to Diplopodia. It may be a 

 Cyphosoma. 



Hemiasterf sp. This irregular echinoid is also represented by 

 a single specimen which shows the form fairly well but does not 

 possess all the essential details of the sculpture and the apical 

 disk. 



Ostreaf sp. A small simple oval form represented by only two 

 or three specimens. 



Pecten sp. The collection contains at least two species of 

 Pecten belonging to the group often called Vola or Neithea which 

 Fischer, Dall and others consider the typical section of Pecten. 

 Several species of this group have been described from the Lias 

 of South America but none of them is identical with any of the 

 present forms from Cuzco, which are more like Cretaceous types 

 of the genus so far as may be judged from such imperfect 

 specimens. 



