50 BRITISH AVONIAN CONODONT FAUNAS 
(iv) Scotland (Figs. 55-58). 
Our general descriptions of Scottish faunas represent only a reconnaissance study, 
our object being to discover whether or not our Avonian zones could be recognized 
there, rather than to provide any comprehensive solution to the complex problems of 
correlation of the Carboniferous of that area. 
We have suggested a provisional application of our zonal scheme to Scotland (Fig. 
15), but have made no precise correlations of individual limestones within particular 
zones, although we believe this will later prove possible. 
Dunbar 
In Dunbar the Long Craig Upper Limestone, which was sampled at 6” intervals 
(DUN 52-71) has a typical G. mononodosus Assemblage Zone fauna, which contains a 
relatively large proportion of mestognathids. The general aspect of this fauna is 
strongly reminiscent of the uppermost Dz Subzone of the North Crop. The over- 
lying Skateraw Lower Limestone (DUN 72, 73) yields a typical G. girtyi collinsoni 
Zone fauna although G. g. collinsoni subsp. nov. itself is present only in the higher of 
two limestone samples. This may suggest that the limestone is transitional between 
this and the underlying zone. The Skateraw Middle Limestone (DUN 74, 82) is 
barren in its lowest sample, but the overlying sample (DUN 75) yields the first 
specimens of G. girtyi turritus, a subspecies which first appears in the upper beds of 
the Dg Subzone on the North Crop. This subspecies continues to be a characteristic 
member of faunas of higher beds. The Barness East Limestone (DUN 87, 88), 
although it has yielded only small faunas, is characterized by a very high proportion 
of cavusgnathids, including both C. naviculus and C. convexus (Fig. 57). 
Midlothian 
Although the limestones of the Lower Limestone Group of Midlothian (NGL 1-17, 
VEX 1, BIL 100-3) have provided no diagnostic species which enable us to correlate 
them with a precise Avonian conodont zone, the overall aspect of their faunas is 
strikingly similar to those of the D3 Subzone of the North Crop. The presence of 
subspecies of G. girtyi and especially the first appearance of G. g. turritus in the 
Vexhim Limestone are useful indications of the general age of these strata (Fig. 56). 
The Gilmerton Limestone (GILM 1-7) was collected from the best available section 
in Midlothian, but this was not the type locality, although we have included it in 
Fig. 56 in the position of the type Gilmerton Limestone in the Lower Limestone 
Group succession. It has a fauna of blades, which are more characteristic of higher 
levels within the D3 sequence. We therefore suspect that the identification of the 
limestone at a quarry one mile S.S.E. of Carlops as the Gilmerton Limestone, as given 
in the Midlothian Coalfield Memoir (1958 : 20), is incorrect. 
Fife 
The Calciferous Sandstone Measures of Eastern Fife are characterized by relatively 
few limestone bands in a thick succession of dominantly clastic strata and coals. 
