1868.] JUDD SPEETON CLAY. 231 



Fig. 4. — Vertical Section, shoiuing the subdivisions of the Sjpeeton Clay. 



Upper Hunstanton Limestone, 



Greensand (?). 30 ft. 



Upper Neoco- 

 Kian, 150fib.+.' 



Middle Neoeo- 

 iii»n, 160 ft.... 



'Black clays 



Dark-blue clays 



V " Cement beds," 30 ft.. 



Dark-blue clays, 80 ft. 



Zone of Pecfen cinctus 



(Sow.), 40 ft. 



" Shrimp-bed " 



Ancyloceras-beds, 30 ft. 



Zone of Am. Speetonen- 

 918, Y. & B., (clays) 

 100 ft. 



Lower Neoco- ■ Zone of Am. Jforicus, 

 mian, 200 ft. -|- . 1 ^ chloth. (clays), 50 ft. 



Zone of Am. Astieri- 

 anus, d'Orb. (pyritic 

 clays) 



Portlandian 



Coprolite-bed ' 

 Fish-bed 



4- 



j Clays and hard dark-co- 

 \ loured rock-bands] 



UpoerKimme- jijaminated bituminous 

 "dge ( clays and slaty beds 



Unconformity. 

 Belemnites (no other fossils). 



Belpmnites semicanaliculatiig, 'Rhynchonella sulcata. 

 Park. 



{Perna Mulletii, Desh., Exogyra sinuata, Pecten elon- 

 gata, P. orbicularis. — Am. Deshayesii, am., sp., Bel. 

 semicanaliculatus, Ancyloceras? grandis. — Thetis 

 Sowerbyii, Panopcea plicata, P. Neocomiensis, Alaria, 

 Vermicularia Sowerbyi.—Terebratula sella, &c. &c. 



Very few fossils. 



Bel.jaculum (rare), &c. 



Pecten cinctus (large var.), Exogyra sinuata (normal 

 form), Ammonites, Ancyloceras JDuvalii, Bel. Jaculum, 

 &c. &c., Terebratula depressa, Meyeria ornata. 



Ancyloceras Duvalii, An. Emericii, Waldheimia Celtica 

 Ammonites bipinnatu^, Will. MS. 



Am. Speetonensis (varieties), Am.rotula, Am. Nisus, &c. 

 Bel.jaculum, Cerithium, sp., Trochus, sp., &c. ; Exogyra 

 subplicata, Thracia Fkillipsii, Pholadomya, sp. ; Wald- 

 heimia Celticu,Pholas constricfa,Serpula articulata, &c. 



Ancyloceras Puzosianum, An. Duvalii, An. Emericii. 



Am. lioricus (varieties). Am. marginatus. 

 Ancyloceras Puzosianum, Bel.jaculum (rare). 



Am. Astierianus, Am, multiplicatus. Am. hystrix, &o. ; 

 Bel. lateralis. 



Exogyra subsinuata (varieties). 



Toxaster complanatus. 



Lucina Portlandica, Lithodomtts, Area, Nucula, Ammo- 

 nites, Saurians. 

 Ammonites gigas. Am. Gravesianus, Am. giganteus?. 



Am. biplex (others of group " Planulati "), Discina latis- 

 sima, Lingula ovalis, Cardium, Inoceramv^, Ostrea 



&c. &c. 



Middle Kim- J Light-blue sandy, and 

 meridge ( dark-blue pyritic clays 



Ammonites mutabilis. Am. triplicatus. Am. biplex. 

 Belemnites. 



Ceromya excentrica ?, Pinna granulata, Modiola, Leda, 

 Pholadomya, Myacites, &c. 



Lower Kimme-) T^ i , i , 

 j,j j_g f Dark-coloured clays . . 



Lowest beds of) 

 Kimmeridge . f ,- , 

 Upper Calca-f^otseen 



reous Grit ...J 

 Coral Rag (only few feet seen) 



Lower Calcareous Grit 



VOL. XXIV. PART I. 



lAmmonites alternans, Ehynchonella inconstans. 



