DAVIDSON — SCOTTrSII CAHDONIPEROUS lilUClUOl'ODA. 4G!J 
G. Black limestone (impure) and shales; Sontli-liill, Cam]),sic. 
7. Main limestone, shale, and ironstone ; Campsie. 
8. Balgroclian Burn beds : shelly limestone, and shales ; 
North-hill, Campsie. 
9. Mill Burn beds : limestone, ironstone, and shales ; 
Campsie. 
10. Balglass Burn beds : ironstone and shales ; Campsie. 
11. Craigenglen beds: limestone (impure), ironstone, and 
shales ; two miles south-west of Campsie 
12. Beds in the valley of Campsie, consisting of thin-bedded 
strata known only by boring. 
13. Ballagan beds : great thickness of thin-bedded nodular 
limestone, marly shale, and red and grey micaceous 
sandstone ; north and west of Campsie. 
14. Old Red Sandstone, of a brick-red colour, and of great 
thickness : has hitherto yielded no fossils. 
The marine limestone and shale extend from Corriebum to the 
Craigenglen beds, and belong to the lower marine limestone forma- 
tion of Scotland. In the valley of Campsie the upper marine lime- 
stone is wanting. 
In Ayrshii'e, AiTan, and Bute we find, with small local differences, 
much of the same order of succession, and most of the fossils that have 
been collected in Lanarkshire, Renfrewshire, Dumbartonsliire, and 
Stirhngshire. Near Dunbar, in Haddingtonshire, we again find similar 
shales and limestones replete with fossils identical ^vith those which 
abound in the parishes of Carluke, Kilbride, at Campsie, Lesmahago, 
&c. And any one would at once conclude that all represent the same 
geological epoch. 
In the Lothians, as well as in Fife, the Lower Coal-measures are 
stated by Mr. Page to have " none of the shaly character, but to 
consist of thick-bedded sandstones, dark bituminous slates, bands of 
ironstone, thin seams of coal, and peculiar strata either of shell-hme- 
stone, or of argillaceous limestone, thought, from the fossils, to be of 
fresh-water or estuary origin ; . . . . and that the lower group, as 
developed in Scotland, differs little in appearance from the upper 
group : hence the term ' Lower Coal-measm^es ' generally appHed to 
it in that country." In these counties the Brachiopoda are not so 
abundantly distributed as in the Clydesdale basin ; still the species 
that have been collected at such places as Dryden, Courland, and 
Scola Burn, near Edinburgh, as well as in other more distant locali- 
ties, do not differ specifically from those found in the other counties 
above referred to. 
We will here conclude the very few stratigraphical observations 
we have thought necessary to introduce, and devote the remainder 
of our paper to the description of the species of Brachiopoda that 
have been liitherto discovered; and, although the series is nume- 
VOL. II. V u 
