Noun
from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects
Source: WordNetAviculopecten subcardiformis; a bivalve from the Logan Formation (Lower Carboniferous) of Wooster, Ohio (external mold). Source: Internet
Conulariid from the Lower Carboniferous of Indiana. Source: Internet
Palaeophycus ichnosp.; a trace fossil from the Logan Formation (Lower Carboniferous) of Wooster, Ohio. Source: Internet
Syringothyris sp.; a spiriferid brachiopod from the Logan Formation (Lower Carboniferous) of Wooster, Ohio (internal mold). Source: Internet
Types of sandstone Schematic QFL diagram showing tectonic provinces Cross-bedding and scour in sandstone of the Logan Formation ( Lower Carboniferous ) of Jackson County, Ohio All sandstones are composed of the same general minerals. Source: Internet