Ehime / Are marine megaliths man-made?
Shimpei Okuhara Yomiuri Shimbun Staff Writer
Ancient
monument or natural feature? Five massive granite boulders off
Shiraishi-no-hana cape in Matsuyama are attracting attention since it
was noticed that the formation seems to function as a solar calendar.
As
rays from the setting sun pass through a gap in the boulders around the
time of the spring and autumn equinox, local historians established an
investigative committee in April to study whether the megaliths had a
religious function. They set up a Web site and asked Ehime University
and other entities to support their research.
The megaliths lie
50 meters off Shiraishi-no-hana--the name means "the nose of Shiraishi."
The five boulders, stacked against and atop each other, measure about
20 meters in circumference and about six meters in height. The gap in
the lower section is two meters high and 50 centimeters wide. Their
gross weight is estimated to be more than 100 tons. The committee named
them Hakuryunoishi (White dragon rocks).
Local historian Kunihiko
Shinozawa, 45, started studying the rocks in January last year as he
suspected they were placed there by humans. In addition the rays of the
setting sun beaming through the gap in the boulders at the equinoxes, he
found a rock that seemed to have been driven into the base of the giant
rocks. There were also traces that humans had worked at the rocks
because this could not be explained by wave or wind erosion.
When
Shinozawa sounded out the prefectural board of education in August over
whether it could preserve the megaliths as a cultural property, the
board said an academic investigation by a public third-party
organization was needed first.
Shinozawa then started trying to raise the profile of the issue by, for
example, presenting the results of his studies at the Iwakura Summit conference
of megalith researchers in Kobe in September and contributing an article
on the megaliths to the December issue of Rekishi Kenkyu, the journal of
the national society for history research, to publicize the megaliths.
He also set up the Matsuyama Shiraishinohana Megaliths Laboratory, which
has its own Web site (http://haku1414.web.fc2.com/).
Shinozawa has held a
viewing event for local residents on four occasions, including the
spring equinox. Kunisato Takechi, 41, a priest at the local Katsuoka
Hachiman Shrine, said he was moved by the beautiful sunrays that shone
through the gap in the rocks and suggested the megaliths could become a
tourist attraction.
Some megalith formations in Gifu and Kochi
prefectures and several other ruins are thought to have been used to
chart the passage of the seasons as sunlight shines through apertures in
them at astronomically significant dates.
"I want to revitalize
the local community by preserving the megaliths as a cultural property
after studying them," Shinozawa said.
(May. 3, 2009)