Journal of the Academy of Natural Sciences of Philadelphia . regular in shape, being somewhat elonga-ted to the north and south. It would seem, judging from the various strata asshown in the plan, that a smaller mound, having its apex to the east of the presentcenter of the mound, had been covered with light brown sand containing a slightsprinkling of shell and a certain percentage of clay, and that this outer layer hadnot been put on in a way to continue symmetrical stratification. About 25 feet from the beginning of the trench, the strata C, D, E, F (seeplan) began abruptly. It is highly pro
Journal of the Academy of Natural Sciences of Philadelphia . regular in shape, being somewhat elonga-ted to the north and south. It would seem, judging from the various strata asshown in the plan, that a smaller mound, having its apex to the east of the presentcenter of the mound, had been covered with light brown sand containing a slightsprinkling of shell and a certain percentage of clay, and that this outer layer hadnot been put on in a way to continue symmetrical stratification. About 25 feet from the beginning of the trench, the strata C, D, E, F (seeplan) began abruptly. It is highly propable that these layers owe their discontinu-ance at this point to some previous comparatively superficial excavation. Thestrata B, C, D, E, F, viewed in connection with other mounds, present no remark-able features, with the exception of the muck layer, D, which we have seen inbut one other mound in the river. No reference to such a stratum existing in any 1 Annual Report of the Canadian Institute, 1887, page 41. THE ST. JOHNS RIVER, FLORIDA. 47. Section efMovnel trf Bluffton. A, center of plateau; B, brown sand and shell; C, lighter brown pure sand; D, Muck layer; E,brown sand with slight admixture of shell; F, shell; H, brown sand with slight admixture of shell; I, shellbase; K, apex of shell base, L, balls of sand; M, point where C, D, E, F, were lost; N, beginning of excava-tion. other mound of the State has come to our notice. The material, while in themound and damp, could be moulded like wax, and slices cut from it resembled thesection of a truffle. Some hundreds of yards from the mound is what is termed amuck pond, and from this was probably taken the material which, with anadmixture of clay and sand formed the stratum. The point at which the various strata reached their highest, with the excep-tion of the outside covering of brown sand, was distant 8 feet east of the termina-tion of the trench, at which point these strata had considerably descended fromsaid apex. At t
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