. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Branner : Gkologv ok Alagoas, Brazii,. 21 up so that some of tluMii lia\o already boon turnod iiite) marshes, and the same process will, in the course of time, obliterate all of them. Lagoa do Norte may be taken as a type of the larger ones of these lakes. This lake has now silted up to such an extent that it is navigable only for vessels drawing a little more than one motor, and that too along a single channel on the south side of the lake. At the time when the region stood higher the lower
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Branner : Gkologv ok Alagoas, Brazii,. 21 up so that some of tluMii lia\o already boon turnod iiite) marshes, and the same process will, in the course of time, obliterate all of them. Lagoa do Norte may be taken as a type of the larger ones of these lakes. This lake has now silted up to such an extent that it is navigable only for vessels drawing a little more than one motor, and that too along a single channel on the south side of the lake. At the time when the region stood higher the lower Rio S. Francisco ran through a steep-sided gorge, and the streams entering it from the sides cut their channels down to or nearly to the level of the main stream. When the depression came the lateral streams were flooded and their former channels are now marked 1)>' lakes, marshes, or broad flat river- bottoms. While the coastal lakes have been filling u\^ with silts from inland, those washed from the immediate coast have accumulated locally under the. Fig. 14. Section showing the relation of the deep well at Maceio to the rocks of the hills above the city. protection afforded by the coral reefs which thri\e along some parts of the coast of Alagoas. In such places the land has been gaining on the sea. Jaragua, the southern part of the city of Maceio, for example, is built upon low ground that lies between the city proper and the coral reefs which help to form the harbor of Maceio. A well two hundred meters deep put down several years ago at the railway shops in Maceio was entirely in loose materials. This fact leads one to conclude that the steep slope of the blufTs, on which the light-house stands, extends for at least two hundred meters beneath the surface of the ground, for these loose materials are not the plateau beds in place, but the later deposits laid down since the depression of this region. Stone Reef.—About three kilometers north-east of the Barra de Sao Miguel
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
