42 



ME. L. RICHARDSON ON THE RH2ETIC OP [Feb. I9II, 



[Charlton Mackrell.] Thickness in feet inches. 



[Below the pyritic bed occurs in some places^ 

 hard, blackish, cr3 r stalline, shelly limestone 

 (with a layer of 'beef') 5 inches thick ; in 

 others, greenish-looking marl in lenticular 

 masses. In yet other places, immediately 

 below the pyritic bed are the black shales 

 of the Lilstock Beds, containing at the 

 very top huge masses of very hard black 

 and grey crystalline limestone, sometimes 

 as much as 2 feet thick, and containing 

 (though rarely) Chlamys valoniensis, 

 Isocyprina ewaldi, Cardinia concinna 

 Sow., aff. regularis Terq., Vanghan, Gyro- 

 lepis alberti Ag., and fish-vertebrae.] 



f Shales, black, thinly laminated, ~) 

 (1) ■< with one or two very thin layers > 2 



(. of pyritous grit ) 





5 a. ■{ 



(2) 



L(3) 



Limestone, black, earthy, mixed 

 with shale, slightly arenaceous . . . 



Shale, black, and similar lime- 

 stone 



}° 



,- * (Limestone, hard, dark grey, crys- ") ~ 

 ' (, talline, very shelly ) 



C Shale, black 



\ limestone 



f Limestone, black 

 ■< layer of ' beef ' 

 (. surface 



ith 



some earthy ") q 



earthy, with a ^ 

 on the nether > 



Shales, black, thinly laminated .. 

 C Limestone, massive, grey, calcite 

 9. < and selenite present, septariform : M- 



( 4 to 10 inches 



10 to ( Shales, black, thinly laminated 



12. 



13. 



14 -i 



15. 



16. 



17. 



18. 



19. 



L 20. 



KEUPER. 



\ about 



! Black and grey indurated, arena- ^ 

 ceous, micaceous shale passing > 

 into hard black shale ) 



Shale, black 



( Deposit similar to 13 but more per- ") Q 

 \ sistent, not passing into black shale ) 

 ( Hard greenish and. black arena- ^ 



\ ceous shale 



C Hard greenish, sandy, micaceous 

 \ limestone 



Black shale-parting 



fHard grey siliceous sandstone. 

 -< The principal Bone-Bed. 4 to 8 



(. inches 



C Shales, black, non-laminated, green- 

 "l ish zone near the organic remains. 

 , Limestone-nodules, hard, greyish, 

 3 somewhat crystalline: to 3 



J inches 



^Shales, black, imperfectly laminated 

 C Indurated, greenish-streaked, black 

 ■< sandy shale, crowded with fish 

 (. remains and small quartz-pebbles 

 f Shales, black, non - laminated, "} 

 < streaked with irregular white > 1 



(. sandstone-layers ) 



C Grey, indurated, sandy mudstone | ^ 

 I passing up into the overlying bed. ) 



~ Non- seq uen ce. 



C ' Tea-green Marls.' Pale 

 £ yellowish-green rocky marls. 



V 



[Compare Sparkford-Hill section, 

 p. 48, and St. Audrie's Slip, 

 pp. 22 & 25.] 



At the very top the following 

 were abundant : Chlamys va- 

 loniensis (Defrance), Pteria 

 contorta (Portlock), Placuno- 

 j psis alpina Winkler,; Isocyp- 

 I rina ewaldi (Born.), and Car- 

 [^ dium cloacinum Quenstedt. 

 C Chlamys valoniensis, Placun- 

 4 3 opsis alpina, and Volsella 

 j (?) minuta (Goldfuss), scales 

 (_ and teeth (?) of Gyrolepis. 

 4 Same fossils as in ha (1). 



[Volsella sodburiensis (Vaugh.), 

 I Pteria contorta, Cardium 

 J cloacinum, Isocyprina ewaldi , 

 ^2 j Placunopsis alpina, Proto- 

 j cardia rhcetica (Merian), scales 

 I of Gyrolepis alberti Ag. 



> Same fossils as in Bed 5 b. 



Shelly. 



C Numerous coproiites and fish- 

 i remains. 



0* 

 6 



5 



3 C Acrodus minimus Ag., Gyro- 

 fi j lepis alberti, Lepidotus ? 

 j (teeth), saurian tooth, copro- 

 L lites, small quartz-pebbles. 

 7i Pteria contorta common. 



li 



4 



3 Lignite abundant. 



Full of fish-remains — Acrodus 

 minimus, Gyrolepis alberti, 

 Lepidotus ? (teeth), and small 

 quartz-pebbles. 



22 



