Page:Field Notes of Junius Henderson, Notebook 2.pdf/93

Boulder, Colo. Boulder, Colorado, June 4, 1908 June 4, 1908

Bright morning with quite a cool breeze. Started north via Red Hill Red Hill, Colorado road at 8:50 a.m., horseback. At 4-Mile Four Mile, Colorado and northwardLyons has a tendency to separate into two or more ridges, but with no intervening Lykins. Just north of Left Hand Left Hand Creek, Colorado a porphyry dyke occurs in the lower Lykins, 50 ft. or more below the Crinkled sandstone, its lower limit is near the Lykind-Lyons contact. Estimated its thickness at 200 feet. The Crinkled forms a low ridge from here to the St. Vrain St. Vrain Creek, Colorado. In Lykins gulch Lykins Gulch, Longmont, Colorado is an almost complete exposure of Lykins and Morrison. Here there are about 50 or 60 feet of deep red sandy shales below the Crinkled and 300 or 400 feet of same above. The Lyons is widely spread here. Reached home at 6 p.m.