Page:Field Notes of Junius Henderson, Notebook 2.pdf/11

 and igneous boulders up to a foot in diameter with a calcareous cement as shown by its effervescence in acid, at least in the upper part. It was in all perhaps 100 feet in thickness. The upper part reminded me of the “mesa caps” in places north of where cemented by a calcareous matrix. Passed northward into, thence westward passing around the head of and tributaries except one which we crossed, thence southward to  over the   and on to camp. Found nothing suggesting the limestone containing Carboniferous fossils mentioned by Darton et al. unless at northwest corner of the quadrangular course of the day’s travel. Saw about 75  flying nearly north. Had a very hard day. It hailed about 10 a.m., immense hailstones falling, with very little rain, so that we kept moderately dry, lying under a low which broke the fall of the hailstones. At 2 p.m. it began to hail and rain furiously and kept it up until we reached camp at 3:15, soaked through and chilled, the ground