Cannonball Cliffs [SEP] continent
Cannonball Cliffs
The Cannonball Cliffs () are cliffs at the south side of the terminus of Neptune Glacier on the east side of Alexander Island, Antarctica. The feature consists of two east-west ridges about high, joined by a narrow north-south ridge. The feature was mapped from trimetrogon air photography taken by the Ronne Antarctic Research Expedition, 1947–48, and from survey by the Falkland Islands Dependencies Survey, 1948–50. The name was applied by the UK Antarctic Place-Names Committee for the sandstone in the area,
calcite and rare late-stage quartz and ferrous dolomite. The much smaller septarian concretions found in the Kimmeridge Clay exposed in cliffs along the Wessex Coast of England are more typical examples of septarian concretions.
Types of concretion Cannonball concretions.
Cannonball concretions are large spherical concretions, which resemble cannonballs. These are found along the Cannonball River within Morton and Sioux Counties, North Dakota, and can reach in diameter. They were created by early cementation of sand and silt by calcite. Similar cannonball concretions, which are as much as