So little is accurately known with regard either to the topography or the geology of the peninsula of Lower California that it seems desirable to put on record whatever new facts may be learned concerning either, even though derived, as in the present instance, from observations made during hasty trips into its interior for other than strictly geological purposes.
Of the topography of the peninsula the only reliable data published are found on the charts of the United States Hydrographic Office (the Narragansett, 1873–75, for both coasts, and the Ranger, 1887, for the west coast), which give the immediate coastline and topographical sketches of the adjoining country for a few miles inland.* The few maps of the interior, whether published or in manuscript, that have been consulted show so much discrepancy with one another and with actual natural conditions, where comparison has been possible, that but little reliance . . .