Page:Field Notes of Junius Henderson, Notebook 1.djvu/110

 observation today goes. The original Denver sandstone bluffs were irregular in outline and deeply incised by lateral gulches. Three former land surfaces were usually discernable: 1) The Denver sandstone, very irregular. 2) A sort of loessoid deposit containing occasional pebbles of fair size suspended somewhat regularly sloping down toward the present bed of the valley. 3) Loose material plainly derived the higher ground in the nature of talus thus ((drawing in field book)). The talus was thinnest above thickening down slope. The Denver beds were massive above with few joints, more argillaceous and thinner bedded below, thoroughly jointed by irregular joints shown by weathered surfaces. It struck me that these