1923 



CHROXOLOGY 



41 



Correlation 



Lower Calc. Grit, York- 

 shire (in part). 

 Upper part of 

 Oxford Clay, 

 Yorkshire 



Cf. We^Tnouth Cla\s with 

 kidney-stones, 250 

 feet thick 

 (H. B. Woodward 

 jur. Rocks y, 



1895. 15) 



Studley Beds, 



Up. Oxford Clay, 

 Oxfordshire 



Horton Beds, 



Oxfordshire 



Kelloway Rock, York- 

 shire, upper part 



Tidemoor Point Beds, 

 WejTnouth 



Kelloway Rock, York- 

 shire, middle part 



Christian Malford Beds, 

 Wilts, and Calvert 

 Beds, Bucks 



Trowbridge Beds ? 



Kellaways Clay (a), 

 Wiltshire 



Sequence IX (continued) 



Strata 



17. ChTieleish Yellow Beds ; 

 Ardassie Limestone, 

 top part 



18. Ardassie Limestone, 



lower part, (Ardassie 

 Limestone, over 20 feet 

 thick, G.W.L.) 



ig. Brora Sandstone, 

 180 feet, G.W.L. 



20. L'ppat Sandstones (over- 

 laid by sandstone, and 

 not far above Fascallv 

 Clay, G.W.L.) 



21. Port an Righ Shales 



22. Port an Righ 



Limestones 

 2^. ChTieleish White Bed, 



20 feet thick, G.W.L. 



24. Port an Righ Calcareous 



Sandstone ; Fascally 

 Sandstones 



25. Fascally Sandstones, 



lowest part 



26. Port an Righ Shales and 



Doggers ; Fascally 

 Shales, (Brickvard 

 Beds) 



27. Lower Brora, 



Upper Clays 



28. Lower Brora, 



Lower Clays 



29. Roof Bed 



Faiom 



RhyncJionelloidea thur- 

 manni, Korythoceras ? 



Cardioceras" spp. 

 (binodulates); Klemato- 

 sphi fides 



Cardioc^ras " cf. tenui- 

 cosiatiim, " C." cf. 

 excavatum (thin) 



Pteria hraamburiensis 



(G.W.L.) 

 Card." cf. 

 Damon, i, 

 cordatnm, 



CXCIV, 2, 



poor 



vertebrale 



2 ; -C" cf. 



d'Orbigny, 



^. Fossils 



Card, scarburgense, C. cf. 



cardia. C. cf. tenui- 



costatu m 

 C. scarburgense, C. cf. 



cardia 

 A sp idoceras sil phone nse, 



CCCLXn'A ; Siither- 



landiceras, CCCXX ; 



Eboraciceras 

 Bourkelamberiiceras cf. 



lamberii, etc. 



Peltoceras cf. subtense 



Kosmoceras " cf. stidch- 

 burii, " K." cf. eliza- 

 bethcB, etc. Zugokos- 

 mokeras zugium, T.A., 

 PI. CCCLXXXIX 

 '•■ Kosmoceras " cf. jason 



" Kosmoceras " cf. e no- 

 datum 



Proplanulites, Gower- 

 iceras 



The strata in Sutherland — Xos. 17-20, 23-2S — are some 560 feet 

 in thickness (G.W.L.), not counting 20, the L'ppat Sandstones, which 

 are of unknown extent. Thus the strata 24, Fascallv Sandstones, to 

 28, Roof Bed, are about 340 feet thick. An interesting point is the 

 considerable thickness developed in beds which mav be said to hover 

 on the Corallian-Oxford Clay border-line — Beds 17 to 2;^ : thev mav 

 possibly represent deposition to a thickness of over 500 feet, and vet 



