172 PROCEEDINGS OP THE ALBANY MEETING 



LOWER PALEOZOIC ROCKS OF THE SOUTHERN NEW MEXICO REGION 

 BY N. n. DARTON 



{Abstract) 



In studying various mountain uplifts in southern New Mexico many new 

 data have been obtained as to the distribution and relations of the representa- 

 tives of parts of Cambrian, Ordovician, Silurian, Devonian, and Misslssippian 

 times. These rocks thin to the north and disappear near latitude 34°, beyond 

 which the Pennsylvanian formations lie on pre-Cambrian granite and schist. 

 The overlap relations of the rocks of the various systems are somewhat com- 

 plex, and it has not been possible to ascertain to what extent the absence of 

 certain formations is due to non-deposition or to removal by erosion. It was 

 found that the Bliss sandstone, El I*aso, Montoya, and Fusselman limestones, 

 Percha shale, and Misslssippian limestone are well represented in the San 

 Andreas Mountains, most of them extending to its north end. They are also 

 exposed in the great section in the west slope of the Sacramento Mountains 

 southeast of Alamagordo. The El Paso, Montoya, and Fusselman limestones 

 are prominent in the Lake Valley, Caballos and Cooks Range uplifts, as well 

 as in some of the ranges in Luna County. The formations are remarkably con- 

 stant in their characteristics and yield many distinctive fossils. 



To be published as Part C^ Professional Paper 108^ United States 

 Geological Survey. 



Presented by title in the absence of the author. 



L0CKP6RT-GUELPH SECTION IN THE BARGE CANAL AT ROCHESTER, NEW 



YORK 



BY GEOKGE HALCOTT CHADWICK 



(Al)stract) 



The deep cut for the barge canal through the Niagara escarpment just west 

 of Rochester affords temporaril;^- a continuous section of the Lockport and 

 (xuelph dolomites from base to practical summit, the first such section ever 

 available. This is being studied layer by layer, as it will become perma- 

 nently under water when the cut is completed. The sections now accessible 

 include 90 feet of Guelpli strata from the summit down, reaching 6 feet down 

 into the Eramosa beds of Williams, and 60 feet of Lockport above the Decew 

 member (10 feet), with a gap of possibly 15 feet not yet excavated in the 

 Eramosa beds of Williams. The positions of the two Shelby horizons have 

 been determined and shown to belong within the limits assigned to them hypo- 

 thetically by Williams. 



This paper will be published in the Proceedings of the Eochester 

 Academy of Sciences. 



Presented in abstract extemporaneously. 



