179 
1916-17.] The Hurlet Sequence and the Abden Fauna. 
which we consider to be a very great advance in accurately determining 
the Hurlet datum line in the East of Scotland, and which we cordially 
homologate, and further correlate it with the Hurlet Alum Shale horizon 
of the West of Scotland. Another important recent advance was that 
made by Dr Crampton * when he correlated certain of the limestones 
exposed at Dunbar with those seen at Aberlady Bay, and the limestones 
in these two sections with certain limestones seen on the shore at St 
Monans on the north side of the Firth of Forth. 
IY. The Hurlet Tvpe Section and other Renfrewshire Sections. 
We now pass to describe a series of sections beginning at Hurlet and 
passing by the way of the Campsie Hills, East Kilbride and Carluke 
to the East of Scotland at Cobbinshaw. Hereafter the sections in the 
Lothians and Fife will be considered and compared with those in the 
West of Scotland. 
As it is only within the last few years that anything like a detailed 
knowledge of the character and sequence of the limestones in the Hurlet 
district has' been arrived at, it is necessary that a summary of the most 
recent results should be given here so as to facilitate comparison with the 
other sections which it is the purpose of this paper to describe : — 
Ft. In.. 
H. 27. Top Marine Band, Lingula , Nucula, and small Producti . . 3 
26. Shales ........... 10 
25. Sandstones .......... 20 
24. Shales, with Johnstone Clayband Ironstone near top . . .100 
G. 23. Top Hosie Limestone (Calderwood Cement), Posidonomya corrugata 1 
22. Lillies Coal and Oil Shale ........ 2 
21. Shale ........... 10 
20. Limestone, encrinital . . . . . . . . .16 
19. Shales . . . . . . . . . . .12 
F. 18. Main Hosie Limestone ........ 4 
17. Hosie Sandstone ......... 50 
16. Shales . . . . . . . . . . .100 
E. 15. Blackball Limestone, crinoidal on top, entomostracan below . 6 
14. Shales, with Househill Clayband Ironstones at top . . .150 
D. 13. Hurlet Limestone ......... 3 
12. Alum Shale .......... 6 
11. Coal impure with pyrites ........ 5 
C. 10. Baldernock Limestone (entomostracan lime with fish remains) . 2 
9. Dark Blaes .......... 6 
8. Impure Limestone with rootlets ....... 10 
* “ The Limestones of Aberlady, Dunbar, and St Monans, ’’ by C. B. Crampton, Trans 
Edin. Geol. Soc ., vol. viii, p. 374, 1905. 
