. The building of an island : being a sketch of the geological structure of the Danish West Indian island of St. Croix, or Santa Cruz. Geology -- Virgin Islands of the United States Saint Croix. THE OF AN ISLAND. 2>7 lighter green. Even the coarser vegetation shows in one place a like result— namely, on the south side of the northwestern block of hills, where on the side of one of the hill-spurs the direction of the stratification may be recog- nized from a distance of a couple of miles to the eastward by the parallel lines of flourishing bush vegetation passing down the hillside.
. The building of an island : being a sketch of the geological structure of the Danish West Indian island of St. Croix, or Santa Cruz. Geology -- Virgin Islands of the United States Saint Croix. THE OF AN ISLAND. 2>7 lighter green. Even the coarser vegetation shows in one place a like result— namely, on the south side of the northwestern block of hills, where on the side of one of the hill-spurs the direction of the stratification may be recog- nized from a distance of a couple of miles to the eastward by the parallel lines of flourishing bush vegetation passing down the hillside. Fig. 14. Jr. IXO-OLOU \)U/f^a.'L£^ High Dip along West Fnd Koah. The dip to the south, above considered, extends over an extensive area, as •we shall presently see, and it is on the upturned edges of these highlv inclined strata that the moderatelv sloping limestones at West End rest. In geological language the limestone rocks here are said to rest unconformably on the Blue- beach, and the same is undoubtedly the case in all other parts of the island where the limestone formation is found. Let us, however, leave this question for the present and return to the study of the early history of the older rocks— that is to say, the history of their making. While it is certain from the fact of their stratification that these rocks were deposited in water, and almost certain that the water was that of the sea, yet it appears at first sight that we can get no other evidence on this point, the general absence of fossils giving us the idea that the sea surrounding the land of that day was so disturbed bv the con- tinual influx of detritus, volcanic ashes and debris perhaps, from the shore, that the sea creatures had no chance to contribute even an occasional bed of lime- stone to confirm the hint which the mere fact of their stratification affords, that the rocks were built up in the sea. And" this idea of the prevailing con- ditions, with certain limitations, is probably
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