I860.] 



AVRIGnT LIAS. 



399 



Section of the Lower Lias Beds at Saltford, seven miles from Bristol, 

 on the Great Western Railway*. 



Litiiology. Thickness. Organic Remains. 



No. feet. 



Brown gravelly marl 120 



Beds of laminated shale 



and clay 110 



Dark clay, with boulders, Scales of Tetragonolepis and Belem- 



and with layers of sep- nites acutus, Mill, 



taria at the top and bot- 

 tom of the bed, and in 



the clay between 105 



59. Grey Lias limestone 100 Rhynchonella variabilis, Schl. 



58. Dark shale Belemnites acutus, Mill. 



Grey Lias limestone. 



Dark shale Ostrea Iteviuseida, Sow., Avicula, and 



Pecten. 

 57. Grey Lias limestone Ammonites Conybeari, Sow., and Be- 



lemnites acutus, Mill. 

 Dark shale. 

 56. Thin hmestone-band. 



Dark limestone Nautilus striatus, Sow., Am. Cony- 



beari, Sow., and Belemnites acutus, 

 Mill. 



55. Grey Lias limestone 95 Lima gigantea, Sow., and Spirifera 



Walcotti, Sow. 

 Dark limestone. 

 54. Grey Lias limestone. 



Dark shale. 

 53. Grey Lias limestone. 



Dark laminated shale. 

 52. Dark-grey Lias limestone... Vertebi'ae of Ichthyosaurus, Am. Buck- 



landi, and Spirifera Walcotti. 



Dark shale Am. Bucklandi, Nautilus striatus, and 



Spirifera Walcotti. 



5 1 . Grey Lias limestone 90 



Dark shale. 



50. Grey Lias limestone Hybodus curtus, Agass. 



Dark shale Vhnlnilamyu glabra, A<*ass. 



49. Grey Lias limestone Nautili'* striatus, Bow. (large), Aai. 



Brookii, Sow., and foam] wood. 

 Dark shales Am. Conybeari, Saw., and Am.Buck- 



laiali. Sow. 



K Grey Lias limestone Vliuratianaria s/w/feSw,, and Lima 



gigantea, Sow. 

 Dark shales Am. Bucilandi, Sow., and Pleuroto* 



mafia si mills. Si >\\ 



47. Grey Lias limestone. 



Dark ahalee 3G I tsConyb .Sow. 



16, (in-v Lias limestone Nautilus striatus, Sow. (large). 



Dark .-hair- Van. item) and /'..'.,. 



rius. Golds 



* This section shows the relative position of ili<- sonesof I 

 landi and Am. planorbis and the Avu ula oontorta Beries in this pari of the 

 county of Somerset, and affords a good type for comparing these aonet in 

 Somersetshire with the Bame groups in other parts of the South of England 



