1916-17.] The Hurlet Sequence and the Abclen Fauna. 
173 
XII. — The Hurlet Sequence in the East of Scotland and the 
Abden Fauna as an Index to the Position of the Hurlet 
Limestone. By Peter Macnair, F.G.S. (With One Plate.) 
(Read December 18, 1916. MS. received February 2, 1917.) 
CONTENTS 
PAGE 
I. Introduction 173 
II. Classification of the Carboniferous Limestone Series of Scotland . 174 
III. Historical Review 174 
IV. The Hurlet Type Section and other Renfrewshire Sections . . 179 
V. Sections between Campsie and Kilsyth . . . . . . .183 
VI. Sections between Hurlet and Cobbinshaw 187 
VII. Sections between Cobbinshaw and the Firth of Forth . . . 190 
VIII. Sections between Charlestown and Pittenweem . . . . .192 
IX. The Bilston Burn Section, 197 
X. Section at Aberlady Bay 198 
XI. Section at Dunbar 199 
XII. Stratigraphical Comparisons and Considerations 201 
XIII. Paleontological Comparisons and Considerations ..... 203 
XIV. Position in the Avonian Sequence 206 
XV. Physical Conditions of Deposition ........ 207 
XVI. Summary of Conclusions 208 
XVII. Literature 209 
I. Introduction. 
In this communication an attempt is made to correlate the different mem- 
bers of the Lower Carboniferous Limestone Series of the East of Scotland 
with what has been chosen as the type section at Hurlet, near Paisley. 
For close on fifty years Scottish geologists have been endeavouring to 
correlate the Lower Carboniferous Limestones of Fife and the Lothians, and 
in general the Carboniferous Rocks of Scotland, with the Hurlet Section, 
but up till the present time the various attempts have only met with a 
partial success, the reason for this being, that our knowledge of the Hurlet 
section has by no means been either sufficiently detailed or accurate enough 
to admit of comparison with other widely separated Scottish sections. 
The important question also arises as to what extent the Hurlet Section 
can be considered as typical of the group of deposits as a whole. The 
recent revision of the Glasgow district by the officers of the Geological 
Survey and the publication of their work gave a renewed impetus to the 
study of these limestones, and within the last few years we have arrived 
