the world > the earth > structure of the earth > constituent materials > stone > a stone > [noun] > containing fossil (4)
A fossil produced by the accumulation of sediment within the stem of a crinoid, forming a ribbed, cylindrical cast thought to resemble a screw; = s…
a fossil produced by the accumulation of sediment within the stem of a crinoid, forming a ribbed, cylindrical cast thought to resemble a screw…
a rounded lump of sandstone or other sedimentary rock containing fossil or mineral fragments in its interior.