. Bulletin of the British Museum (Natural History), Geology. SHELVE INLIER 47 3oo-. -300 Fig. 31 Geological map of the area SW of Rorrington. Overlaps Figs 25, 28. 9 = Weston Member; 10 = Betton Member; 11 = Meadowtown Member; 12 = Rorrington Member; 13=Spy Wood Member; 14 = Aldress Member; black outcrop D = dolerite. (SO 29, SO 39, SJ 20, SJ 30) at Grey Grass Dingle, Loc. 334 is of interest as having yielded Nemagraptus in addition to O. debuchii and M. arcuatus. The remaining outcrops of the Rorrington Member occupy a not inconsiderable area but, owing to the regressively-weathering nature o
. Bulletin of the British Museum (Natural History), Geology. SHELVE INLIER 47 3oo-. -300 Fig. 31 Geological map of the area SW of Rorrington. Overlaps Figs 25, 28. 9 = Weston Member; 10 = Betton Member; 11 = Meadowtown Member; 12 = Rorrington Member; 13=Spy Wood Member; 14 = Aldress Member; black outcrop D = dolerite. (SO 29, SO 39, SJ 20, SJ 30) at Grey Grass Dingle, Loc. 334 is of interest as having yielded Nemagraptus in addition to O. debuchii and M. arcuatus. The remaining outcrops of the Rorrington Member occupy a not inconsiderable area but, owing to the regressively-weathering nature of the rocks, reveal few exposures. In the area west of Little Weston, at and around the head-waters of Coed Brook, no exposures are documented on Whittard's maps and the outcrop is apparently delimited on the basis of the Spy Wood and Meadowtown Members, both of which are more clearly recognizable. South of the ENE-WSW fault already noted near Little Weston, p. 45, the outcrop is shifted eastwards and its eastern boundary is faulted against the Weston Member of the Priestweston area. The mapped outcrop of the Rorrington Member is fairly extensive but, again, sections are few though a small tributary stream of Coed Brook shows exposures of rocks in the highest part of the Member c. 1850 ft (564 m) at 101° true from Hagley farm. From west to east there are good exposures at first of fine-grained, medium-grey, tuffaceous grit, followed by blue-hearted, rusty- weathering shale. Then, at Loc. 309, there are more massive beds traversed by numerous calcite veins. The shaly partings at this locality yielded Marrolithus bilinearis Whittard, a species generally found in the Spy Wood Member, and a single specimen of Platycalymene duplicata (Murchison) was recorded (Whittard 1960a : 156). Farther east in the same section, Loc. 310 exposed fossili- ferous, blue-hearted, micaceous shale interbedded with bands of tuff up to 9 in (23 cm) thick; recorded fossils include rare Spirantyx calvarin
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