Page:Field Notes of Junius Henderson, Notebook 4.pdf/131

 may be and probably is distant. At nine o'clock I conducted a field excursion in geology explaining the geological history of the canyon and mesa. Clear and warm by 10 a.m. I experimented with tufa and included fragments in water. The igneous inclusions sink instantly, the light tufa very slowly, especially the very light pieces which look like an older tufa included in the new. In the cliffs no assortment whatever occurs. I do not believe it could have been deposited in water. Why have this canyon and the Rio Grande Canyon been cut through basalt in places instead of along the vertical contact? Are prevailing winds from the south. Judge Abbott says south winds passing over canyon produce an eddy, so that they blow toward his house from the north. This would suck out soft material on north side and affect cliff.