48 POMPECKJ. JURASSIC FAUNA OF CAPE FLORA. [noew. pol. exp. 



No. 6. There are also numerous pieces of cone-in-cone structure (" Tuten- 

 mergel, Nagelkalk") corresponding, petrographically, in every respect with the 

 above-mentioned rock-type. They were found loose on the talus, on July 10th 

 1896, at a height of 100 feet (30 m.) above the sea, behind Elmwood, and 

 on July 12th about 100—180 feet above sea-level, IV2 klm. NW. from Elmwood. 



No. 7. Clay-sandstone. From finely-grained to extremely finely-grained, 

 compact, to some extent calcareous, clay-sandstone, with tiny lamellae of 

 white mica, is represented by a large number of specimens. In an un- 

 weathered state, the stone is hard, gray or dark-gray. Most of the pieces 

 are surrounded with a brown, or rusty red weathered crust of varying 

 thickness. A few pieces, owing to the great amount of weathering they have 

 undergone, are soft, and dyed through and through, from a rusty brown to 

 red. Pyrites and its derivative limonite, occur in small irregular accumulations 

 partly as fossilising material, especially of ammonites. 



The finely grained varieties very much resemble the more sandy varieties 



of the rock of type, No. 4. 



Most of the pieces contain fossil remains, ammonites especially (partly 



pyritic) being of frequent occurrence, their shells ghttering like mother-of- 

 pearl (partly only impressions of small specimens and broken impressions 

 of very large ones); next, less frequent fragments of belemnites, and then a 

 number of species of lamellibranchs, each represented usually by but one or 

 two specimens. Most of the lamellibranchs described in the following chapter 

 are embedded in clay sandstone. Indistinct traces of plants (?) also occur. 

 The greater number of pieces of clay sandstone were collected on July 

 16th 1895, at a height of 500—550 feet (150—165 m.) above sea-level, behind 

 Elmwood, cf. p. 14, "Upper horizon"; and of this majority again, most were 

 found loose, for they were surrounded with a weathered crust, and must 

 therefore have been subjected to weathering for a considerable time on the 



talus. 



Some few pieces without, or with only a thin and imperfect weathered 



crust, have been found in situ about 550 feet above sea-level, or have fallen 

 down from their bed a comparatively short time before. There is no doubt 

 that at Cape Flora, there are nodules of clay sandstone in places at an aver- 

 age height of 500 — 5-50 feet above sea-level, and near the lower edge of the 



