Had a talk with Ordway about the general structure of Mexico. He holds that Mexico on the US, are not related geologically. The Archon of Mexico was in lay at continuous elevation always high and unequal elevation. It was a piece of another nucleus upon which the sea did not encroached until (I gleaned this from his remarks for he did not say it) Cretaceous time. At Terrantique, the Carboniferous sea did attain but further north certainly not before Jurassic. In Arizona one have considerable geologies and according to the view the sea must have encroached from the North and West. Therefore the Mexican Archon our- cless must have extended Southward and includes the Car Antilles. The suggestion of Ordway is very suppostori. He says he has traveled into California and Arizona to see the Mexico connected, and sees more, One can separate very carefully as one geologically. A few miles south of Tomellin station a very fine contact is shown between the Middle Cretaceous and the Tertiary conglomerate. Here it is core made of of Cret. Permian faces. A mile and a half north are Pegmatite (on sample). The Cretaceous hereabouts in the canyon Tomellin.