CHAPTER XXVI. 
TABULAR VIEW OE GEOLOGICAL STRUCTURE OE SOUTHERN NEW 
MEXICO, NEAR THE GILA. 
It may be interesting to some to have the strata of southern New Mexico compared with those 
in other known parts of the globe. For the general standard the classification of M. Huot, 
modified by Charles D’Orbigny, has been assumed. The allocation of several of the beds is 
done with great diffidence, partly from the poverty of those strata in fossils, and partly because 
some have been already classed under formations different from those in which they are now 
assigned. This is particularly the case with the upper red sandstones, which have been classed 
in Triassic, but are here moved down into the Permian formation. 
General. 
Quaternary. 
New Mexico. 
Modern alluvium. 
Ancient alluvium. 
Fresh water beds_ 
Marine beds_ 
Raised beaches--- 
Ancient turbaries_ 
Loess of the Rhine_ 
Bone licks_ 
Caverns with hone remains- - -. 
Beds with diamonds and gems. 
Gila, San Pedro, and Bravo River valllea. 
Around Fort Yuma. 
Pliocene. 
Miocene. 
Eocene. 
Gold, platinum, and metallic ores.... 
Drift and diluvium. 
Erratic blocks. 
Micaceous sands of Gila river; conglomerate clay of San 
Pedro river. 
Loose sand and gravel of the desert south and east of the 
Colorado river. 
Tertiary. 
Pleistocene.. 
Older pleiocene_ 
Upper bed.. 
Middle bed.. 
Lower bed_ 
Upper bed_ 
Middle bed.. 
Lower bed_ 
econd glauconic bed. 
Stratified sands and clays of the Colorado desert. 
Do. do 
Conglomerate rock of the Gila, Goat mountain, and the 
district west of the Pimas villages. 
