LOWER GREENSAND. 



381 



beds are overlaid unconformably by the White Chalk and Red 

 Chalk, and they rest on the Kimeridge Clay and Portland Beds, 

 which were formerly included with them. The Speeton Clay 

 represents the Lower Greensand and Wealden Beds, but no portion 

 of it appears to be of the age of the Gault.^ A section near 

 Givendale Church, described by Prof. J. F. Blake, showed con- 

 glomerate, and variegated sandstone, not unlike the Carstone of 

 Norfolk, overlaid by Red Chalk, etc.- 



Prof. J. W. Judd has made the following divisions in the 

 Speeton Clay : ^ — 



Speeton 



Clay (Lower 



Cretaceous < 



or 



Neocomian). 



[//>/>er Beds. 

 150 feet. 



A/uMe Beds. 

 150 feet. 



Lower Beds. 

 200 feet. 



Portia lid Beds. 



Kimeridge 

 Clay. 



Black and dark-blue clays, 120 feet. 



Cement-beds, 30 feet. Light-blue clay containing 



regular layers of large septaria. 

 Dark-blue clays, 80 feet, with a few septaria. 

 Zone oi Pecteii ductus, 40 feet, dark-blue clays. 

 (Shrimp -bed in lower part : nodules containing 



Rleyeria [Astaciis] oniata.) 

 Ancyloceras-beds, 30 feet, dark-blue clay with 

 layers of septaria. 

 I' Blue Clays. Zone of Anunoniles Spectonensis, 



100 feet. 

 j Clays. Zone of Am. N'orictis, 50 feet. 

 j Pyritic clays. Zone of Am. Astieriai/ns, 50 feet. 



Coprolite-bed. Phosphatic nodules and Saurian 

 V remains. 

 I Fish-bed. 

 ( Clays and hard dark-coloured rock-bands. 



i Laminated bituminous clays and slaty beds. 

 Light- blue sandy and dark-blue pyritic clays, 

 with jet. 

 Dark-coloured clays. 



Among the fossils recorded by Prof. Judd are the following: — 

 Ancyloceras, Ammonites Deshayesii, Aporrhais {Rostdlaria) Parkinsoni, 

 A. bicarinata, Trochtis grajiulatus, Nucula ohtusa, Isocardia a7igulata, 

 PanopCBa Neocomiensis, Thracia Phillipsu, Pecten orbicularis (Upper 

 Beds); Meyeria ornata, Bdemnites jaculiim, Ancyloceras Duval ii, A. 

 Emericii, Exogyra sinuata, Pecten cinctus (Middle Beds) ; Belemnites 

 lateralis. Ammonites Speetonensis, A. Astierianus, Exogyra Coulojii 

 (Lower Beds) ; Am^nonites rotundus, Lucina Portlandica (Portland 

 Beds); and Belemnites nitidus, Ammonites rotundus, A. biplex, 

 Exogyra virgula, E. 7iana, Biscina latissima, and Li?igula ovalis 

 (Kimeridge Clay). 



The Septaria are used in the manufacture of Portland cement ; upwards of 1000 

 tons being annually sent to Hull. Some of the light-coloured clays in which the 

 cement-stones occur, produce a fine quality of the same cement. The Coprolite- 

 bed is worked also for artificial manure. Inland the clays are worked for brick- 

 makine. 



1 Godwin-Austen, Proc. G. S. iv. 197 ; J. Leckenby, Geologist, ii. 9 ; Rev. T. 

 Wiltshire, Ibid. 264 ; Phillips, Geol. Yorkshire, Part I, edit. 3, p 99. 



2 G. Mag. 1874, p. 363. 



^ Q. J. XXIV. 218; see also C. F. Strangways, Explan. Sheets 95 S.E. and 

 S.W. (Geol. Surv.), p. 25. 



