YORKSHIRE (NORTH RIDING) 12 5 
♦ 
Lower Calcareous Grit) ; echinoderms abundant in the impure oolites. The 
brachiopod Thurmanella and various lamellibranchs found in the grits below j 
also the microscopic spicules of the sponge Rhaxella. 
Blake, J. F. and Hudleston, W. H. 1877, p. 363 ; Wilson, V. 1933, pp. 490, 
498 ; 1936, p. 264, with geol. map. 
Geol. Surv. N.S. 53 j Ord. New Pop. 92. 
Arkengarthdale, 11 miles S.E. of Brough. Stream-section in Mirk Fell 
Beck, south of Mirk Fell Bridge* near Tan Hill Colliery. 
Upper Carboniferous (Mirk Fell Beds, E 2 subzone) ; abundant zaphrentid 
corals, goniatites ( Cravenoceras ), lamellibranchs ( Nuculopsis ), etc., in ironstone 
beds. 
Hudson, R. G. S. 1941, p. 259. Chubb, L. J. and Hudson, R. G. S. 1923, 
p. 274. 
Geol. Surv. O.S. 97 N.W. ; Ord. New Pop. 84. 
— Askrigg, Wensleydale, 12 miles W. of Leyburn. Stream-section in Am 
Gill, 1400 yds. N.N.E. of Askrigg Church. 
Carboniferous, Yoredale Beds (Middle Limestone and shales, D 2 subzone) ; 
corals ( Oriotiastraea , Lithostrotion ) at base of, and brachiopods ( Gigantoproductus ) 
in, Middle Limestone with sponges in shale-parting ( Erythrospongia lithodet). 
Zaphrentid corals in overlying shales. 
Hudson, R. G. S. 1929, p. 181. Hudson, R. G. S. and King, W. B. R. 1933, 
p. 429. Hudson, R. G. S. and Fox, T. 1943, p. 101. 
Geol. Surv. O.S. 97 N.W. ; Ord. New Pop. 90. 
Askrigg. Stream-section, Grange Gill, from below Bow Bridge upstream 
to Abbey Force, on both sides of Askrigg-Sedbergh road. 
Carboniferous, Yoredale Series (Gayle Limestone and Shale, subzones); 
algal nodules ( Girvanella ) below Bow Bridge ; corals (. Lithostrotion ) between 
Hockett and Bow Bridge ; and corals ( Aulophyllum , Zaphrentis) with brachio- 
pods at Abbey Force. 
Hudson, R. G. S. and King, W. B. R. 1933, pp. 429, 431. 
Geol. Surv. O.S. 97 N.W. ; Ord. New Pop. 90. 
Askrigg. Stream-section, lower part of Mill Gill, about half-a-mile W.N.W. 
of Askrigg Church. 
Carboniferous, Yoredale Series (Gayle Limestone and Hardraw Shale, p t 
subzone) ; brachiopods ( Chonetes , Gigantoproductus ) in limestone ; productids, 
lamellibranchs ( Posidonia ) and goniatites in shale. 
Hudson, R. G. S. and others 1933, p. 227. Hudson, R. G. S. and King, 
W. B. R. 1933, p. 429. 
Geol. Surv. O.S. 97 N.W. ; Ord. New Pop. 90. 
Aysgarth, Wensleydale, 7| miles W. of Leybum. Section in left bank of 
stream by bridge at Aysgarth Falls. 
Carboniferous, Yoredale Series (Gayle Shale and Limestone, Di subzone) ; 
corals (. Aulophyllum and zaphrentids) and brachiopods common in the Gayle 
Shale. 
Hudson, R. G. S. and King, W. B. R. 1933, p. 432. 
Geol. Surv. O.S. 97 S.E. ; Ord. New Pop. 90. 
Boltby, 5 miles N.E. of Thirsk. Natural exposure below Boltby Scar, 
about 1 mile S.E. of Boltby village. 
Jurassic, Oxford Clay (15-20 ft.) on Kellaways Rock ; ammonites very 
common in the Oxford Clay. 
Geol. Surv. N.S. 52 ; Ord. New Pop. 91. 
Burniston, 5 miles N. of Scarborough. Coast section in Burniston Wyke 
and at Cromer Point. „ „ , 
Jurassic, Inferior Oolite, sandstones of Middle Estuarine Senes and the 
Scalby Plant Bed just S. of Cromer Point ; footprints of small dinosaurs . in 
