186 Proceedings of the Royal Society of Edinburgh. 
[Sess. 
D. 
C. 
B. 
16. Sandstone flaggy and ripple marked, limey and oolitic in part 
15. Limey shales with large encrinites and oryozoa .... 
14. Encrinital limestone (Hurlet Limestone) ..... 
1 3. Black and grey shales, with characteristic brachiopod, lamellibranch, 
and fish fauna ......... 
12. Coal 
11. Ashy fireclay with limey nodules (position of Baldernock Limestone) 
10. Nodular green limestone with abundant brachiopods and corals 
(upper part of Blackbyre Limestone) ..... 
9. Coral limestone represents a coral reef (lower part of Blackbyre 
Limestone) .......... 
8. Limey shales with Rliynchonella and nodules containing corals 
and brachiopods ......... 
7. Shale with ironstone bands ....... 
6. Naiadites crassa bed ......... 
5. Shales with Telangium affine and marine fossils .... 
4. Beds containing Naiadites crassa ...... 
3. Shales graduating down into volcanic mud with oolitic ironstone 
nodules ........... 
2. Sandstone ........ . . 
1. Ashy muds and conglomerate ....... 
Ft. 
150 
2 
15 
6 
In. 
10 
4 
6 
12 
8 
20 
3 
8 
In stream section No. 1 the beds 26 and 27 in the above table are 
exposed ; they are brought down by a fault against the basal members of 
the section. In the remaining three streams the strata dip east and south- 
east at a low angle, strike north and south, and present their principal 
escarpments on the east banks of the streams. In stream No. 2 the strata 
from 1 to 15 are exposed, in stream No. 3 the strata from 16 to 19, and in 
stream No. 4 the strata from 20 to 26. 
Beginning at the base of the section, we note in the first place the 
ashy muds and conglomerates well shown in the bed of the stream. The 
sandstone, No. 2 in the table, is on the same horizon as the Hollybush 
Sandstone. The Naiadites crassa bed, No. 6, is the same as that which 
occurs over a great part of North Ayrshire immediately below the Dockra 
Limestone. The Blackbyre Limestone, Nos. 9 and 10, presents all the 
characteristic features of that limestone as seen both in the East and West 
of Scotland. The Hurlet Coal is succeeded by the Alum Shale, carrying 
the Bone Bed, Lamellibranch band, and Brachiopod band in ascending order. 
The Hurlet Limestone, No. 14, by the accession of calcareous shales has 
attained a thickness of 15 feet, compared with 4 feet at Campsie. The 
next calcareous horizon is the Blackhall Limestone, Nos. 17 and 18 in the 
table. It presents exactly the same lithological and palseontological 
