July 19. Friday Humber Arm He started at 9 A.M. with James O' Routes launch of the Humber Arm in a dark morning. It soon began to rain and it continued or all day. The hardest raining day of the trip. It is our plain that all of Romley's Cambrian-Ordovician (his green area) is Pottergrie. He went up the Humber river about 3½ miles and went ashore at the "Limestone Quarry" where marble is quarried in the paper mills. This is a white and yellowish marble with blue grays standing nearly vertical. It is once or less cracked and in another place was somewhat schistose. See the samples. One mile down stream we saw a dark micaceous schist with grains of schistose limestone. It is much crinkled and deformed. Another mile down stream in Martle Head and it appears to be the same marble seen farther up stream. This marble is all of 3000 feet thick and may considerably exceed this thickness. The schist is as thick though the marble appears to be thicker. He saw these beds for 3½ miles and as the dip is nearly vertical and as the river cuts practically across the strike it is certain that the thickness in fault of what I saw from the railway window in 1900 as ledged rock is truly such that this is an area of vertical strata of not less than 7 to 8 miles across. As this is nothing Paleogric looking at my these rivers and as they are far more metamorphosed than the deformed Paleogrics it is plain that they cannot be regarded as other than a Pottergrie age. The thickness appears to very great. The contact between the Pottergrie highland and the Paleogric lowland along the river is hurried beneath a thick mantle of present sand and boulders. The latter is the old delta of the Humber when the sea level stood above.