IN THE SOUTH OF SCOTLAND. 429 



TABLE OF SILURIAN STRATA, GIRVAN. 



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1. Blair and Straiten Beds. Grits, flags, and shales. 



Beyrichia Kloedeni. Thickness, 500 feet. 



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2. Drumyork Flags, Bargany Group. Shales, etc. 



Cyrtoyraptiis Grayi, M onoyraptus priodon. 1100 feet. 



1. Penkill Group. Grits, purple shales. 



Monograptus exigims, Crossopodia. 1000 feet, 



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3. Camregan Group. Grits, limestones, shales. 



Rastrites maximus, Pentamerus. 200 feet. 



2. Saugh Hill Group. Flagstones, shales. 



Monograptus spiniyerus, Rastrites peregrinus. 500 feet. 



1. Mulloch Hill Group. Conglomerate, sandstone, shales. 



Diplograptus acuminatus, Meristella. 350 feet. 



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ARDMILLAN SERIES. 

 5. Drummuck Group. Mudstones. 



Dicellograptus anceps, Trinudeus. 400 feet. 



4. Barren Flagstone Group. 



Diployraptus truncatus, Nematolites. 800 feet. 



3. Whitehouse Group. 



Dicellograptus, Pleurograptus, Trilobites. 300 feet. 



2. Ardwell Group. Flagstones, shales. 



Climacocjraptus caudatus, Dicranoyraptus. 1200 feet. 



1. Balclatchie Group. Mudstones, conglomerate. 



Climacoyraptus bicornis. Fossils abundant. 100 feet. 



BARR SERIES. 

 4. Benan conglomerate. Thickness, 500 feet. 



3. Graptolitic Mudstones. 



Didymograptus superstes. 30 feet. 



2. Stinchar Limestone. 



Trilobites, brachiopods, corals. 60 feet. 



1. Kirkland Group. Sandstones, conglomerate. 



Orthis con finis. Local unconformaJbility. 240 feet. 



3. Radiolarian Cherts, mudstones, volcanic tuffs, 



Arenig and Lower Llandeilo cherts. 70 feet. 



2. Bennane Head Black Shales. Interleaved with volcanic 



agglomerate. 

 Tetragraptus bryonoides. 3-4 feet. 



1. Volcanic rocks, lavas, tuffs, with fossiliferous intercalations. 



Approximate thickness, 1500 feet. 

 Base not seen. 



