Sunday June 3-1910 Arisaig. Remained in the house during the morning finishing the Antiesti joba with Troughel. In the afternoon walked out 2½ miles to Mrs. Ares Brook to see the so-called Deronian of red shales and agylacens sandstones (Arie say they are tuff, stratal and volcanic ashes). Near the Shore Road side Williams found 3 fragments of fish remains. These deposits are evenly laid but at various levels occur brick red shales full of small more or less living nodules. These look more like continental deposits than the rest. Going down the brook to near the shore one comes upon a great mass of the dark basalt underlaid by the Carboniferous and conglomerate of continental origin. Both of these tub of against the Deronian in such a way that their great position must be due to a fault. the basalt at the top of the Stonehouse Lillenic cuts it off here as at the Deronic of Mrs. Ares Brook. There must be a fault here for in no other way can be explained the position of these Carboniferous basalts against the Lillenic. These basalts are clearly sheet flows for they are full of flow dikes near the base. There are at least two of these flows interwoven with the Carboniferous conglomerate of continental origin. Also basalt of the same character that bits up again the phylite at the base of the Lillenic section at Arisaig join.