338 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Sonoma County Farm Advisor in searching for limestone suitable for use 

 in liming the adobe lands in this county. The work upon the Petaluma 

 Quadrangle necessitates a connection with the coastal area around Tomales 

 Bay, so that exploring in this region was started. The Point Reyes 

 Triangle, the land mass on the west side of Tomales Bay, had been pre- 

 viously mapped in a most excellent manner by the former curator of the 

 Department, Mr. F. M. Anderson, so the time available was devoted to a 

 study of the east side of Tomales Bay and the headlands which project 

 into the bay. As is well known, the Tomales Bay region is in the San 

 Andreas Rift Zone. Immediately along the recent rift of 1906 some inter- 

 esting deposits of Pleistocene age were found in the small headlands on 

 the east side of the bay. Study of these beds resulted in the recognition of 

 two formations of Pleistocene age separated by a well marked unconformity. 

 The beds of the lower formation have been so tilted and faulted that 

 dips as high as 30° were recorded in several places. Both of these forma- 

 tions yielded estuarine faunas mixed with wood and pine cones which Miss 

 Eastwood has kindly identified as the Monterey pine (Pinus muricata). 

 These pine cones occur in both formations and they are particularly inter- 

 esting in that the pine now found in this region is Pinus radiata, and not 

 Pinus muricata, which does not range this far north at present. Thus the 

 flora indicates that these Pleistocene deposits were probably laid down dur- 

 ing a warm interglacial epoch or epochs. This conclusion is further con- 

 firmed when the Molluscous fauna is studied. Most of the species of this 

 fauna are now found in the waters of San Diego and are entirely lacking 

 in the waters of Tomales Bay. These faunas are estuarine and likewise 

 the character of deposits are those of a Pleistocene Tomales Bay. That 

 Tomales Bay existed during the Pleistocene, is very evident when the 

 evidence is studied and it seems entirely probable that the Point Reyes 

 Triangle has been subjected to movements quite different to those of the 

 mainland. 



The mollusks of the Carrizo Creek beds are being studied and the new 

 species are being described. An Eocene fauna from Peru which was col- 

 lected by Mr. Clark Gester was found to contain "that finger post of the 

 Eocene," Vcnericardia planicosfa, with other interesting forms which have 

 been previously described, but their formal relations were unknown. Mr. 

 Gester recognized this species in the field and thus obtained a key to some 

 of the Peruvian Tertiary problems. 



In June, the curator was granted leave by the Academy and was em- 

 ployed by a California oil company in exploration work. Incidental to 

 this work, he obtained several interesting collections from Oregon and 

 Washington which contain a few new forms. Professor Earl Packard, 

 while in charge of the Geology Department of the Agricultural College of 

 Mississippi, made a collection of some fine material from the type locality 

 of the Chipola marl, a celebrated Miocene horizon of Florida. These 

 collections will be particularly valuable to students who are interested in 

 Pacific-Caribbean problems. He collected such material from the Missis- 

 sippi Cretaceous as well. Professor Packard, who is now located at the 

 University of Oregon, is arranging to collect for the California Academy of 



