"Seem like old flows and volcanic meets. [illegible] mountain series? It is all a puzzle to me, for a number of miles to the crest. It is either an igneous or a metamorphic or trap rocks. Cretaceous covering faro de clues. [illegible] or another great plain volcanos. At 4:45 P.M., we are at Marfa. Alt. 4692 barnij passed on the summit at 5082 ft. Marfa is a county seat on a wide plain into which the drainage in the moun- tain cuts. Pp. 3,170. This is 60 miles east of Chatham. We now seem to be passing over Cret. and Cenozoic rocks upon which have been deposited volcanic flows. Some must have been volcanoes, but all are now greatly eroded that often the lava flows appear plain enough. When the sun set the dust to the north more fine air dusted and coming to the north of them their track formed over the