Wormy rock Unusual rock formations of the country’s natural monument

Wormy rock

Introduction of Wormy rock

There is a strange rock called “Mushikui-iwa"(means Rocks eaten by insects) at Ikenoyama, Kozagawa-machi, Higashimuro-gun, Wakayama Prefecture.
The official name is Takaike’s Enormous Rock, which is designated as a national natural monument.
It is also one of the main landscapes of Japan’s 100 Geological Selections, the Kozagawa Arc Dyke.

As you can see in the picture, it looks like a honeycomb pattern, and the rock surface is like a hole eaten by insects.

Is the exposed rock surface about 10m high and about 30m wide?
As a tradition, it is said that the demon has eaten his favorite rock.

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Rhyolite pyroclastic rocks, which erupted magma between 15 and 14 million years ago, weathered to form bug-like tafoni.
It is thought that the cause of weathering is that gas escaped, but it is thought that during the process of water evaporation from the surface, microcrystals such as gypsum grew and the rock surface was peeled off and formed.

The size of the holes varies in size, but there are many holes with a diameter of about 10cm and a depth of 4cm to 5cm.

In addition, there is a peony rock that forms the same tafoni as the insect erosion rock in the west, and there seems to be several places where similar holes are opened near this, such as the engraved rock of Urakami facing the sea.
The area where the volcanic activity continued is another famous tourist attraction, Hashitakeiwa.

Transportation to the Wormy rock

Immediately in front of the Wormy rock, in 2014, the roadside station, Wormy rock (Michino Eki-Mushiki-iwa) was completed, and there is a free parking lot, so it is very easy to visit and there are no stairs, Even elderly people can visit immediately by simply visiting by car.
The sightseeing time is about 5 minutes and the tour is available 24 hours.
Map of Wormy rock(Michino Eki-Mushiki-iwa)