| | | a | Russia by marine formations, and in | Lower Barren measures. | | | r | central and western Europe by numerous | Lower productive Coal-measures. | | | b | small basins containing a peculiar | Pottsville conglomerate. | | | o | flora and in some places a great variety| Mauch Chunk shales; limestones | | | n | of insects. | of Chester, St Louis, &c. | | | i | Westphalian or Moscovian--Coal-measures, | Pocono series; Kinderhook | | | f | Millstone Grit. | limestone. | | | e | Culm or Dinantian--Carboniferous Limestone| | | | r | and Calciferous Sandstone series. | | | | o | | | | | u | | | | | s | | | | | . | | | | +---+-------------------------------------------+----------------------------------+ | | Devonian and Old Red Sandstone. | | P +----------------------+------------------------+----------------------------------+ | a | Devonian type. | Old Red Sandstone | | | l | | type. | | | a +----------------------+------------------------+ / Catskill red sandstone; Old | | e | / Famennian. | Yellow and red | | Red Sandstone type: the | | o | Upper < | sandstone with |< strata below show the | | z | \ Frasnian. | _Holoptychius_, | | Devonian type. | | o | | _Bothriolepis_,&c. | | Chemung Group. | | i | | | \ Genesee " | | c | | | | | | / Givetian. | Caithness Flagstones | | | o | Middle < | with _Osteolepus_, | / Hamilton Group. | | r | \ Eifelian. | _Dipterus_, | \ Marcellus " | | | | _Homosteus_, &c. | | | P | | | | | r | | Red and purple | / Corniferous Limestone. / Upper | | i | /Coblentizian.| sandstones and | | | Held- | | m | Lower < | conglomerates with |< Onondaga Limestone.