is a mountain range on the western coast of Hokkaidō. It is part of the

Mashike Mountains are a group mountains on the western coast of Hokkaidō. The mountain range is divided into two regions by the Hamamasu River. The northern region is a group of volcanic mountains called Shokanbetsudake Mountains. The southern region is known ...

Geology

Early

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

aged igneous and sedimentary rocks are exposed in the Kabato Mountains and are referred to as the Kumaneshiri Group. The Kumaneshiri Group specifically consists of mudstone,

volcaniclastic Volcaniclastics are geologic materials composed of broken fragments ( clasts) of volcanic rock. These encompass all clastic volcanic materials, regardless of what process fragmented the rock, how it was subsequently transported, what environment it ...

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...

and tuff, as well as reworked volcanic-sedimentary conglomerate, and tuff breccia. There are also

pillow lava Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava underwater, or ''subaqueous extrusion''. Pillow lavas in volcanic rock are characterized by thick sequences of discont ...

and dykes. The peaks of the Kabato mountains include the following: * Pinneshiri (Kabato) * Mount Machine * Mount Kamuishiri

References

Mountain ranges of Hokkaido {{Hokkaido-geo-stub