. Bulletin of the Natural Histort Museum. Geology series. LOWER LIAS OF ROBIN HOOD'S BAY 93. Fig. 14 The prominent hard calcified shale of bed 447 in front of Peter White cliff. Howarth photograph. 10 September 1991. lowest bed of the Lower Pliensbachian. The most prominent bed on the map is bed 474, Double Band, which forms Billet Scar (see Fig. 16). The narrow excavation through beds 476^186 known as The Dock, was originally made for fishing and smuggling purposes. GEOLOGICAL STRUCTURE OF ROBIN HOOD'S BAY The pattern of the outcrops on the foreshore of the bay as seen in Fig. 4 is deter
. Bulletin of the Natural Histort Museum. Geology series. LOWER LIAS OF ROBIN HOOD'S BAY 93. Fig. 14 The prominent hard calcified shale of bed 447 in front of Peter White cliff. Howarth photograph. 10 September 1991. lowest bed of the Lower Pliensbachian. The most prominent bed on the map is bed 474, Double Band, which forms Billet Scar (see Fig. 16). The narrow excavation through beds 476^186 known as The Dock, was originally made for fishing and smuggling purposes. GEOLOGICAL STRUCTURE OF ROBIN HOOD'S BAY The pattern of the outcrops on the foreshore of the bay as seen in Fig. 4 is determined by the structure of the rocks (Fig. 17). That structure was first alluded to by Tate & Blake (1876: 27, 196) who described Robin Hood's Bay as 'a complete inlier ... in the form of a mound, dipping in all directions from the centre . . the centre of elevation beneath the sea, nearly opposite the centre of the bay'. In the Geological Survey memoir, Fox-Strangways & Barrow (1915: 3, 115) referred to the Lias as 'curving over in a gentle arch or anticline'. Versey (1939: pi. 15) plotted the contours of the base of the Grey Limestone (=Scarborough Formation; Lower Bajocian) over a wide area and showed that around the southern and western sides of Robin Hood's Bay they formed the outer part of a north-west to south-east elongated dome. According to Versey (1939) the dome was produced by tectonic movements probably in the late Pliocene. Kent (1974: 25, 26) and de Boer (1974: 281) accepted the date of formation of the dome as later than the mid-Tertiary Alpine move- ments and probably Pliocene. The central part of the Robin Hood's Bay dome can be defined by the outcrops of the Lower Lias on the foreshore of the bay. Fig. 17 shows contours on the outcrop at 10 m bed-thickness intervals, with the 0 m contour starting at the top of bed , Low Balk. Because the outcrop on the foreshore is essentially flat, the contours approxi- mate closely to strike lines, and they form
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