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  • Said of a rock or mineral that solidified from molten or partly molten material, (that is from magma).
  • Pertaining to the classical third glacial stage of the Pleistocene Epoch in North America, between the Yarmouthian and Sangamonian interglacial stages.
  • Said of a compact rock or soil hardened by the action of pressure, cementation, and especially, heat.
  • Cambrian age sandstone formations occurring under northern and central Illinois which are clean, white, coarse to fine grained. Neither outcrop in Illinois. Thin dolomite beds may occur in upper part of the Ironton.
  • The interface between ice and the glacier foreland or pro-glacial zone.