and 'worms' tracking & burrowing including long thin vertical tubes up to 2' long in some of thicker ss beds. Silt contact both at base and top is very variable. Locally this unit grades 1st into upper 5' of underlying silts - at one place this is very abrupt & may be channel. At Color weathered is light brown, some OB beds, some light gray where silt present. Whole is rather distinctive Fall River-like zone. Upper 4.0 is dome, silty to silty shale, heavily Fe stained locally. But loc. goes 1st to ss. Shale, gray, finely silty with laminize siltst - some ss beds at base. Top is apparently leached for 1.0' which is light gray with terruginous layer 0.2 at base. Sandstone, massive ledge, chiefly fine-grained), with clay pellet calte zone at base which loc. is med. q.t. Fe conc. structures, chiefly @ under 38