October 3, 1862: Millville
We had heard of coal mines discovered up [Cow] creek, about fifteen miles from our camp, so [today] Rémond and I started for them, intending to be gone two days. Our ride was a gentle ascent, sometimes passing over tables sloping to the west and elevated perhaps a hundred feet above the surrounding country. These were remarkable, being made up of strata of volcanic ashes, sometimes mixed with bowlders of lava. This had covered the entire region, but up about fourteen miles from camp we found where the stream had cut through these strata into the sandstone beneath, which is rich in fossils—shells of many species were as thickly imbedded in the rocks as if the sea had but lately left these shores.
It was a solitary region, with houses only at intervals of several miles. We did not find the coal mines, did not find the men who were to show us where they were, could find no place where we could get shelter or feed for our animals, so returned the same night. It rained in the night, and drove us into the tent.