. Geological magazine. W. S. Greski/—On Cone-in-Cone Structure. 21 into the cone-in-cone formation on the one hand and disappearing inthe opposite direction, namely :—towards the periphery of the nodule(see Fig. 5). i^l*^. 2o, A peculiarity in the appearance or arrangement of this spheruliticstructure is that the surface of it often takes a beautiful wavy orfantastic stalagmitic form, giving the idea that the substance of thestructure was in a semi-fluid condition during formation of thebotryoidal structure. The aspect is not altogether unlike a numberof flat bunches of very small grapes, disp
. Geological magazine. W. S. Greski/—On Cone-in-Cone Structure. 21 into the cone-in-cone formation on the one hand and disappearing inthe opposite direction, namely :—towards the periphery of the nodule(see Fig. 5). i^l*^. 2o, A peculiarity in the appearance or arrangement of this spheruliticstructure is that the surface of it often takes a beautiful wavy orfantastic stalagmitic form, giving the idea that the substance of thestructure was in a semi-fluid condition during formation of thebotryoidal structure. The aspect is not altogether unlike a numberof flat bunches of very small grapes, disposed in more or less regularrows or terraces one above another (see Fig. 6). The globules orspheres forming the apices or lowest points of these little wavy ridgesare always the largest or most perfectly developed of the individualgroups or bunches. These tiny spheres contain a considerable per-centage of lime, as do the cone-in-cone masses which are encircledby them. With respect to the mineral constituents of cone-in-cone rock,Mr. Young seems to hold that calcareous matter was essential to itsexistence. As many of my specimens are not afiected by the acidtest, the lime, if originally present, has been since remov
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
