3 72 Dr. L. F. S-path — Lower Lias Aininonites from Skye. 



and conyheari) nor the uppermost (Agassiceras) subzone of 

 Oppel's original " BucMandi-Bett " seem to be represented by 

 ammoaitiferous deposits. In Raasay, however, Arnioceras occurs 

 above beds with Agassiceras sauzeanum, and at Mingary Castle in 

 Ardnamurchan, Argyllshire, the higher beds with Agassiceras and 

 probably also the Pararnioceras zone are developed, the latter 

 being equivalent to Oppel's tuherculatus zone (with P. compressaries 

 and P. nodosaries, Quenstedt sp., as characteristic Ammonites), and 

 to Wright's wrongly named turneri zone, also originally proposed 

 for the " Pentacrinite Bed ". Still higher beds at Mingary Castle 

 include Arietites, and though it might be inferred from certain 

 passages in Oppel and Quenstedt that the Pentacrinus bed 

 (— tuherculatus zone) should inchide the hircJii subzone, yet these 

 higher Arietites and hircM beds are rather to be considered as 

 belonging to the ohtusus zone, which thus is divisible into at least 

 ten subzones. Beds with Asteroceras smithi and Xipheroceras ziphus, 

 planicosta, and dudressieri on the western side of Broadford Bay, 

 north of Corry, could not be connected with the highest beds of 

 Ardnish to the east. They consist of the same metamorphic 

 micaceous rock with the Ammonites coated with blue vivianite. 

 But among a few of these Ammonites of the Asteroceras and 

 Xipheroceras types from the western side of Broadford Bay, 

 collected by Mr. J. Phemister and submitted to the writer through 

 the kindness of Professor Gregory, there was an example of a late 

 Arnioceras (" Eparnioceras ") comparable to A. semicostatum (Young 

 and Bird) Fucini, indicating the probable presence of the hirchi 

 zone below the beds with Xipheroceras. 



It might be mentioned that the Survey Memoir records a form 

 " near to Asteroceras hrook{e)i ", apparently from between Sgiabain 

 and Achadh a' Chuirn ; but this may, perhaps, be ?, form similar 

 to the Paracoroniceras sp. of the gmuendense-gvowp recorded below 

 from 15 inches above the isis bed at R 2.i The writer has found 

 no evidence for any 'post-scipionianus beds on the eastern side of 

 the bay, and there is thus a considerable stratigraphical gap between 

 them and the beds on the western side, north of Corry. 



The thicknesses given in the following pages are approximate. 

 The Survey consider division iv to be exposed to at least 125 feet. 

 The writer has not been able to make out anywhere a continuous 

 succession of more than perhaps 40 feet. The repetition of, e.g., 

 the acuticarinatus bed, with the cutting up of the beds by numerous 

 dykes and the occasional occurrence of more highly metamorphosed 

 beds with unrecognizable Ammonites, make the tracing of the true 

 succession very difficult. Moreover, the strike coincides practically 

 with the trend of the coast-line. 



The succession is as follows, Beds R 4 to R 1 being to the south- 



^ In the Alps a development with somewhat similar outer whorl (Pseudastero- 

 CERAS, gen. nov., type A. stellcBformis, Giimbel in Waehner, v, 1888, pi. xlv, 

 ,fig. 2) occurs already in Lias a 3-4, just above the marmorea zone. 



