1863.] SALTER UPPER OLD RED SANDSTONE. 481 



terlineata, Sow., and Phacops latifrons, Bronn. But with them are 

 present species of the new genus Curtonotus, of Ctenodonta, Modiola, 

 Chonetes (small species), Bellerophon, and Aviculopecten (two or 

 three species) ; also Encrinites of the genera Actinocrinus, Poterio- 

 crinus, and Rhodocrinus, all abundant. 



There are also black nodules, which contain phosphates dissemi- 

 nated in the shale along certain lines, and they are, I believe, drop- 

 pings of Fish. They exactly resemble those in the very similar 

 slate- series of Angle. There are crowds of Encrinites, not, so far as 

 I can make out, of the same species, but exceedingly like those of 

 the Angle Bay section. 



There are Orthoceras and Nucula, a small spiral Euomphalus, 

 smooth and black, and a minute Loxonema, — all of which closely 

 represent analogous forms in the West Angle series. And there are 

 the occasional pebble-beds (layers of flat shale-pebbles mixed with 

 black nodules of various sizes), and the shells above mentioned, 

 with Curtonotus, long meandering sand-lines, drifted patches with 

 Shells in them, Annelide-burrows, &c, all as at Angle. 



Some of the species at Baggy Point are identical with those at Angle. 

 I do not know how to distinguish the Rhynchonella from R. pleurodon. 

 I find it exceedingly difficult sometimes to decide if the Spirifer 

 be S. disjunctus or one of the varieties of S. attenuatus, &c. But 

 these doubtful cases (and there are not many of them) are overruled 

 by the fact that the characteristic Shells are all of the Devonian type. 

 The catalogue given (p. 480) scarcely contains a Carboniferous form ; 

 on the contrary, the peculiar species are abundant throughout. 



As this is both the most complete and most accessible section, I 

 will here say of it that the dip continues southwards, though with 

 several minor faults and flexures, to Croyde Bay (where there is 

 good accommodation for the geologist), and here the highest beds of 

 the series are still full of Phacops latifrons ; while the Chonetes and 

 other shells, such as Athyris concentrica, are common. Spirifer lami- 

 nosus, a Carboniferous fossil, occurs here among them, but rarely. 



The section on the south side of Croyde Bay is only a repetition 

 of that on the north, and the cliff's along the coast to Saunton show 

 only the same fossil forms. 



Exactly similar sections are obtainable along the Ilfracombe road 

 from Braunton, along the course of the Knowlwater to Marwood, 

 and again from Barnstaple. On this last section a few notes may 

 suffice. I had the advantage here of the great local knowledge of 

 the Rev. F. Mules, who has produced a MS. map of the range of 

 the several subdivisions of the rocks of North Devon. It gives the 

 general course of these formations with accuracy, from Morte Bay to 

 Exmoor, beyond which the Marwood beds have not yet been traced. 

 I did not myself go quite so far east. 



The road-section from Muddiford to Barnstaple shows a perfect 

 sequence from the purple slates, through the white band, to a well- 

 developed Marwood group. The great quarries at Sloly are those 

 best known as containing the Lepidodendra, Catamites, and other 

 Plant-fragments first described by Professor Sedgwick. I have the 



