I860.] 



WHIGIIT — LIAS. 



403 



Ammonites angulatus, Schloth. 



Greenoughii, Sow. 



tortilis, d' Orb. 



Nautilus striatus, Sow. 

 Pleurotomaria similis, Sow. 

 Ostrea irregularis, Miinst. 

 Gryphsea incurva, Sow. 

 Unicardium cardioides, Phil. 

 Pecten textorius, Schloth. 

 Lima gigantea, Sow. 



antiquata, Sow. 



pcctinoides, Sow. 



Mocliola Hillana, Sow. 

 Avicida Sincmuriensis, (V Orb. 

 Pinna diluviana (Zietc/t, pi. 55. fig. 6). 

 Pholadoinya glabra, Agass. 

 Terebratula psilonoti, Quenst. 

 Rhynchonella variabilis, Schloth. 

 Spirifera Walcotli, Sow. 

 Pseudo-diadeina (spines). 

 Cidaris Edwardsii, Wr. 

 Pentacrinus tnberculatus, Mill. 

 Isastrtea Murchisoni, Wr. 



3. The Zone of Ammonites Turneri. 



Synonym*. — " Hauptpentacrinitenbank dcs untern Lias," Quen- 

 stedt, Flbzgcb. p. 152, 1843. " Lumacliellc do Pentacrinites basalti- 

 formis," Mareou, Jura salinois, p. 47, 184G. " Die Schiehten des 

 Pentacrinus tuberculatus," Oppel, Juraformation, p. 44, 1856. 

 "Tuberculatus-bed," Wright, Quart. Journ. Geol. Soc. vol. xv. p. 25, 

 1 858. " Marne de Strassen," Dewalque et Chapuis, Fossiles dc 

 Luxembourg, 1853. " Marne de Strassen," Dewalque, Dcserip. du 

 Lias de Luxembourg, 1857. 



This subdivision of the Lower Lias forms a well-marked zone of 

 life. The beds consist of light-coloured argillaceous limestone, of 

 bard greyish limestone, or of deep-blue, shelly, indurated shale, in- 

 terstratined with beds of dark-coloured clay. Many of the slabs of 

 limestone arc covered with shells and portions of tbe stem and side 

 arms of Pentacrinus tuberculatus. From one of these slabs, collected 

 at Frethern or Purton in Gloucestershire, Miller's original specimen 

 of this Crinoid was obtained. 



Gloucestershire and Warwickshire. — The zone of Ammonites Tur- 

 neri was exposed at Bredon, in the deep cuttings of the Midland 

 Railway, from whence many of my specimens were obtained. Por- 

 tions of these beds are sometimes laid open in the Yale of Glou- 

 cester in making drains, asat Badgeworth and Ilardwick : and many 

 fine slabs are occasionally procured from the river-section at Purton. 

 1 know of no locality in (doucotershiiv, however, where the entire 

 Beries is exposed. My friend Dr. Oppel referred the Saurian beds 

 of Brockeridge Common to this series, supposing them to be the equi- 

 valent of the Saurian beds at Lyme, which appertain to the sone of 

 Ammonites Turneri; but the description which 1 have already given 

 of the Am. planorbis beds and their correlations have demonstrated 

 thai the beds at Brockeridge Common represenl the Am. planorbis 

 Beries. In Warwickshire the Am. Turneri beds constitute the base 



of what is called in that tenuity the ■■ ( 'ardiuia-.serii ■<." which in- 

 cludes all those strata of the Lower Lias extending from the .(»'. 

 Turneri to the Am. txuricostatus bods, and which are oharaoteriied b) 

 different forms of Cardinia Listsri, Sow. 



Dorsetshire, At Lyme Regis the Ammonites BucJclandi or Lima 

 Beries is overlain b\ thick beds "t cla\ and slat\ mails containing 

 many Bnaliosaurian skeletons, with aumerous fishes, in fine pre- 

 -i rvation ; these strata arc known to local collet tors as the Fish- and 



