A MONOGRAPH 



OF THE 



BRITISH FOSSIL CORALS 



(SECOND SERIES.) 

 Part IV.— No. 2. 



VIII. Corals from the Zone of Ammonites angulatus. 



{Continued.) 



There are some Coralliferous deposits belonging to the Lower Lias at Inkbarrow, at 

 Chadbury, in Worcestershire, and Eladbury, near Evesham, whose exact geological horizon 

 has not been determined. They are low down in the Lower Lias, but their commonest 

 Corals do not identify them with the Coralliferous beds of Brocastle. The genus Isastraa 

 is dominant in these localities, and its species are unlike any which have been described. 

 The Corals will not do more than associate these beds on one horizon. There is a 

 great probability, from the presence of small Gasteropoda, whose shells are left in the 

 calices of the Corals, that careful search will yield a sufficient number of fossils to deter- 

 *mine whether these deposits are below the Zone of Ammonites Bucklandi. Our present 

 knowledge does not justify the association of these IsastracB with the Coral-fauna of the 

 Zone of Ammonites angulatus. 



The Coralliferous deposits at Abbott's Wood, Harbury, Aston Magna, and Down 

 Hatherly may belong to more than one zone ; but, from the association of Thecosmilia 

 Michelini, Thecosmilia Martini, and Septastraa Fromenteli, the presence of the Zone of 

 Ammonites angulatus may be satisfactorily asserted. 



There is an Isastraa found in the Lower Lias of Lyme Regis, which is said to belong 

 to the Zone of Ammonites angulatus, but the mineralization of the specimen and its affini- 

 ties are sufficiently distinct to associate it with the beds containing Ammonites Bucklandi. 



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