The sandy beach of Shichirigahama is formed by the erosive action of the sea and includes strata of sedimentary rock with occasional fossils. The sand is primarily geological but with some marine elements also present.
Geographic Overview
Shichirigahama is known for its beautiful scenery as well as its historical, cultural and geological features. Beach activities include swimming and surfing and its stunning stunning coastline with views of Mount Fuji.
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Sand Gallery
Clear quartz sand grains, some with focal and patches of black inclusions that are probably horneblende, are accompanied by light tan feldspar (see upper right) with characteristic right degree angles and black basalt grains. Smooth edged partially translucent and pale pink marine shell fragments are present at the left edge of this view.
This low magnification features clear quartz and some feldspar grains along with several black, likely basalt, grains. Some of the clear quartz have black inclusions that are likely amphibole (horneblende) prisms. In addition to these geological grains a large dark brown shell fragment (upper left), reddish brown and yellow marine shell fragments, and a centrally located reticular white and red shell fragment are present in this sand sample.
Yellow, light tan, orange, red, pink and white shards of marine shell fragments with smooth edges are present in this view along with angular grains of clear quartz and black basaltic geological components of beach sand.
A mixture of geological and marine sand grains are present in this low magnification view. The larger reddish brown and light tan grains are marine bivalve fragments that have been worn smoothly by wave action. Smaller clear quartz and black basalt grains comprise the majority of this sample.
Red and reddish-tan smooth marine grains located in the center and lower center are probably bivalve chards. Clear quartz grains, some with black inclusions, are plentiful. Pale yellow-tan angular grains of feldspar are represented at the lower right along with black terrigenous basaltic grains.
Sand grains in this view include clear quartz, quartz with black inclusions, pale tan feldspar, and black basalt. A large rectangular tan marine chard, probably a bivalve fragment, is prominent at the left of this image.
Geological origin sand in this view include clear quartz grains, some with punctate black inclusions, and pale-yellow feldspar with right degree angles. Marine shell fragments to the immediate right of center include a pale-yellow triangular shard, an off-white rounded shard, and two light brown triangular fragments, one with subtle stripes. A larger white and semitranslucent triangular marine shell fragment is near the upper left of this image.
Partly clear, pale and dark tan and light pink grains of marine fragments, some with subtle linear striations, are evident in this sample along with a sea urchin spine fragment with linear groves just below center. Other grains include clear and cloudy quartz and black basalt sand grains.