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SUPPLEMENT TO THE BRITISH 
Brachiopoda that lived during the Carboniferous period, and especially so during the 
deposition of the limestone series and its accompanying shales. 
SCOTLAND. 
The geology and palaeontology of the Carboniferous period has been elaborately 
investigated by the Geological Survey of Scotland, under the able directorship of Archi- 
bald Geikie, E.R.S., as well as by many indefatigable, independent Scottish geologists, the 
larger number being Eellows of the Geological Societies of Edinburgh and Glasgow. 
Too much praise cannot be bestowed upon those gentlemen who have devoted many 
years of their lives to carefully assembling, and drawing up catalogues of, Scottish fossils ; 
a subject demanding considerable time, knowledge, care, and research. 
Mr. Geikie informs me that a general section of the Scottish Carboniferous system 
is as follows : 
Coal-measures Series 
Millstone-Grit 
Carboniferous-Limestone Series . , 
Upper Red Sandstone. 
Coal-measures. Upper Coals. 
Flat Coals of Midlothian. 
Calciferous-Sandstone Series 
Millstone-Grit, or Moor Rock. 
Upper Limestones. 
Lower Coals. Edge Coals of Midlothian. 
" Lower Limestones and Hurlet Coal. 
:;| Cement-stone Group. 
Red Sandstone Grit. 
L 
The X marks the place of the Corrie limestone of Arran. Mr. Geikie adds, "Of course it is open 
■to any[one to say that the Calciferous Sandstones are = base of Carboniferous Limestone and whole of 
the Lower Limestone-shales." 
