1866.] DXryCAN — I2s'FEA-LIAS COEALS OF SOriH TVAIES. 21 



Lr:M:ACHELio. 



In the Lumachello, or the zone of Ammonites Burgundies, a large 

 coral, in the form of a cast, has been named Isastrcua basalt if ormis. 

 The arkose, or zone of AiicuJa contorta, beneath the Lumachello is 

 uncoralliferous. By examining these hsts the affinities between the 

 fannce of Brocastle and the Sntton series, and of the npper zone of 

 the Infra-Lias of the Cote d'Or, are readily seen. The similarity of 

 the hthological conditions is also remarkable. 



In the dachy of Luxembourg the following succession of beds 

 is seen * : — 



1. Calcaire a Grrphees arquees. 

 Lias .,.{ 2. Grres calcareux. 



3. Calciiire graso-bitumineux. 

 An unconformability exists here. 



4. Crystalline grits, 



5. Coloured marls. 



The Gres calcareux immediately beneath the Calcaire a Gr}-phees 

 arquees consist of three beds. The lowest is unfossiliferous ; and the 

 uppermost is either unfossiliferous or presents a bed full of Lima 

 Fisheri, or sands with lignites. The middle bed is highly fossili- 

 ferous, and contains amongst others the following species : — 



Keuper -j 



Littorina clathrata. 

 Turritella Dmikeri. 

 Turritella Zenkeni. 

 Phasianella nana. 

 Ceritliium gratum. 



acuticostatum. 



iS"eritopsi3 exigua. 

 Cardinia regularis. 



Cardita Heberti. 

 Gerrillia acuminata. 

 Lima compressa. 



tuber culata. 



Spondjlus liassinus, Tq-m. (Plica- 

 tula intusstriata, Em.) 

 Ostrea irregularis. 

 Isastra?a Sinemmnensis. 



The hmestone beneath, with Lima pu.nctata and Ostrea leviuscula, 

 Jliinst., rests upon the bone-bed. 



The relation of this fauna to that of South Wales is very remark- 

 able. 



The Calcaire de Yalogne, with the beds between it and the Trias 

 or Granite, the Foie de Veau, the Lumachello beneath, and the 

 Arkose above the Trias, the Gres calcareux of Luxembourg and 

 Hettanges, with their associated bituminous limestones, lower marls, 

 and bone-bed resting unconformably on the grits and marls of the 

 Keuper, have much in common. They are lithologically distinct 

 from the Tiias beneath, and from the beds containing Grypficea in- 

 curva above. The Calcaire de Yalogne is unconformable with the 

 Gryphsea-Hmestone, and the bone-bed of Luxembourg is uncon- 

 formable to the Keuper. The sequence of their beds is exact, and 

 a great number of their species are identical. They have a peculiar 

 fauna, and, as might be anticipated, some species which have a great 

 range ; and a certain number pass upwards into the Gri/pJicea-incurva 

 beds. These species are sufficiently numerous to connect the strata 

 as parts of one formation ; but it is very evident that the fauna of 

 the highest beds of these series have great mutual resemblances, 



* Terquem, Pal. de Hettange, 1855.. 



