Median Tectonic Line Black Schist (Tokushima Prefecture) [Famous Stones of Japan]

Median Tectonic Line Black Schist

MTL is an abbreviation for the Median Tectonic Line, which was discovered in 1885 by Edmund Naumann, a German geologist who studied the geology of Japan.
Its history dates back to when Japan was still part of the continent, and it is believed that MTL was formed 140 million years ago during the Jurassic and Cretaceous periods.
Due to extremely strong plate activity, the faults shifted significantly, causing the Japanese archipelago to bend in an L-shape and become separated from the continent, resulting in the formation of the current Japanese archipelago.
This black schist can be collected anywhere on the MTL, not just in Tokushima, but there are only a limited number of places where the MTL can be observed exposed.
Like Solomonite, this stone has been subjected to very strong energy and pressure from the Earth.

MTL is an abbreviation for the Median Tectonic Line, which was discovered in 1885 by Edmund Naumann, a German geologist who studied the geology of Japan. History says that the MTL was formed when Japan was still a continent. Due to very strong plate activity, the tectonic line shifted significantly, causing the Japanese archipelago to bend in a U-shape and separate from the continent, completing the current Japanese archipelago. This black schist can be collected anywhere on the MTL, not just in Tokushima, but there are only a limited number of places where the MTL can be observed exposed. Like solomonite, it is a stone that has been subjected to very strong energy and pressure from the earth.