CALCIPEEOTJS SANDSTONE OF PIFE. 569 



Fig. 1 shows the sequence of the beds forming this zone, which 

 is only one example of several of the immediate succession of 

 marine conditions after coal-growths. 



The same series of beds with the same fossil contents is again 

 seen on the coast two miles or more to the east, near Caiplie. 



Over 50 feet of purple and yellow sandstone and grey shale inter- 

 vene*, and then Myalina modioliformis is again found abundantly 

 in a thick bed of shale enclosing ironstone nodules above and three 

 or four bands of ironstone below. 



Fossils of Zone 13, at 3338 feet 

 Littorina scotoburdigalensis, Etk. \ Nematoptycbius Grreenockii, Acf. 



Mjalina, -modiolifornis, Brown. Coprolites (Rhizodus?). 



Beyrichia subarcuata, Jo7ies. I 



Leperditia Okeni, var. scotoburdiga- 

 lensis, Hib. \ 



Pifty feet of measures intervene, chiefly purple and yellowish 

 sandstone, forming the point known as Billow Ness. Immediately 

 below the sandstone there is a bed of red and grey shale with thin 

 layers of red ironstone, full of Myalina and Entomostraca. 



Fossils of Zone 14, at 3400 feet f. 



Oythere superba, J. ^ K, 

 Coprolites (Rhizodus?). 



Littorina scotoburdigalensis, Eth. 

 Myalina modioliformis, Brown. 

 Pleurophorus elegans, sp. nov. 



A bed of limestone lies below the shale. The only fossils found 

 in it are coprolites, scales of small Ganoids, Lep. scotoburdigalensis, 

 Lepidodendron, and Lepidopliyllum. 



Underlying these strata follow nearly 20 feet of fireclaj^ and 

 shale with several bands of coarse coal, which are full of vegetable 

 remains, including the stools and flattened trunks of trees. Other 

 measures come in beneath, making a thickness of nearly 50 feet 

 before Myalina modioliformis is met with again, in a bed of grey 

 shale and ironstone bands. 



Fossils of Zone 15, at 3450 feet f. 



Spirorbis, sp,, attached to the 



Myalina. 

 Lepidophyllnm, and fragments of 



otber plants. 



Twenty feet of yellow and purple sandstone and shale, with a 

 coal about a foot thick, intervene. Many remains of Lepidodendron, 

 Calamites, and other plants are found near the top of the sandstone. 

 Beneath these beds there is a limestone, 6 inches thick, containing 

 Myalina sp., and under it a thin bed of marl with Stigmarian 

 rootlets. 



Fossils of Zone 16, at 34:75 feet f. 

 Myalina, sp. 



* Since the reading of this paper a thin limestone has been exposed between 

 tide-marks, about 20 feet below the strata forming zone 12. The following 

 species occur in it : — Littorina scotoburdigalensis, Leperditia Okeni, vars. extu- 

 berata and attenuata, Spirorbis carbonarius, Ganoid scales, and traces of plants. 



t Zones 14, 15, and 16 are seen on the east side of Billow Ness. 



Myalina modioliformis, Brown 

 small and thin-shelled. 



Leperditia Okeni, var. scotoburdiga- 

 lensis. Rib. 



