State by State


  • Specimen Number


  • Description

    Cut block of coarse-grained, possibly oolitic limestone.  Classified as a grainstone, defined as a non-muddy, clast-supported sandstone consisting  limestone (calcite/arragonite) grains,  Pore spaces filled by  light-colored lime cement.  Massive and uniform in appearance. Fizzes with weak acid.

  • Classification

    Sedimentary. Limestone. Grainstone.

  • Location & Occurrence

    Likely from northern Arkansas, a suggestion by state survey staff.  Paleoenvironment of  tropical-subtropical shallow seas on edge of carbonate bank with strong wave action.

  • Geological Age


  • Geoheritage

    Such uniform limestones are commonly quarried for dimension stone because the rock is fairly soft and easily cut into the desired shape. The stone crumbles in a carbonized atmosphere.

  • Links

    Link to State Geological Map from USGS.  Link to State Geological Survey.

  • Other

    See separate list for acknowledgements.

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Specimen stone for Alaska.
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