and hard to friable. They are not sharply divided from the Lyons beds above, but pass into the latter by a zone of alternating coarse sands and conglomerates and fine grained sandstones, gradually becoming more calcareous. The Lyons equivalent differs from the beds near Boulder in containing limestones, and in being more easily eroded and softer in general, more or less calcareous. The Lyons grades into the Lykins by an alternation, the pink sandstone being overlaid by a few feet of deep red clay, then another few feet of pink sandstone, then the red beds begin in earnest. The North Poudre Ditch turned into the {{place}Box Elder Creek, Colorado|Box Elder}} has started a period of deep erosion which is extending up the lateral gulches by headward progression.
