Oct. 14. Spent the day in the quarries to the north of Alpena on the road to Long Lake. In places the beds are regular in deposition and thick-bedded. In other places the beds rise rapidly in domes and here the rolls are crowded with Acervularia, stromatopora and also other corals. In these beds I saw quite a number of Dolotocinues. I can account for these domes only by supposing that the corals have furnished the material for the dome and that here the deposition was far more rapid than were the corals did not occur or sparsely. In places on or near these domes dark bituminous beds occur abounding in a small Favosites and Acervularia. These beds are probably local. Where the beds are regularly bedded in one place I saw two to three feet of shale or shaly limestone overlying it.