schists

The geology of the ecoregion is characterized by Precambrian metamorphic rocks such as schists, amphibolites, quartzites, and gneiss.

Atlantic Equatorial coastal forests 2008

Whilst the country to the north-east of the lakes is mostly composed of rocks, of great age, geologically, such as schists, quartzites, and old dolerytic rocks, with newer but still ancient trachytes, that to the south-west of them is formed principally of recent volcanic tufas and lavas, the irruption of which has not yet ceased.

The Naturalist in Nicaragua Thomas Belt 1855

A large zone of schists runs south-west to north-east across the park, dissected in places by tributaries of the watercourses which run parallel to it.

Taï National Park, Côte d'Ivoire 2008

Weathering also left a gigantic sheet of hard iron-quartzite jutting out of the eroded piedmont schists and granite gneiss.

Mount Nimba Strict Nature Reserve, Guinea and Côte d'Ivoire 2008

According to the investigations of these expeditions, South Victoria Land consists of a vast, ancient complex of crystalline schists and granitic rocks, large extents of which are covered by a sandstone formation ( "Beacon Sandstone," Ferrar), on the whole horizontally bedded, which is at least 1,500 feet thick, and in which Shackleton found seams of coal and fossil wood (a coniferous tree).

The South Pole~ Fram Expedition Geology 2009

It is, therefore, tolerably certain that the underlying older formation of gneisses, crystalline schists and granites, etc., is of Archæan age, and belongs to the foundation rocks.

The South Pole~ Fram Expedition Geology 2009

A first cursory examination of the material was enough to show that the specimens from Mount Betty and Scott's Nunatak consist exclusively of granitic rocks and crystalline schists.

The South Pole~ Fram Expedition Geology 2009

The Park consists of a lateritic peneplain, with rock outcrops of quartz, schists and gneisses.

'W' National Park, Niger 2009

The schistose rocks from Scott's Nunatak are streaked, and, in part, very fine-grained quartz diorite schists.

The South Pole~ Fram Expedition Geology 2009

Mica schists do not occur among the specimens from this mountain.

The South Pole~ Fram Expedition Geology 2009