| August 7,2006
Longtime fossil researchers and Earth Science
lovers, Tsuyoshi Adachi and Shigeru Murakami, found gray objects sticking out
of the Sasayama layers. The two dug out parts of two rib bones.
| August 8,2006
Mr. Adachi cleaned the bones at home. After checking books and other references,
he believed them to be dinosaur fossils.
| August 9,2006
Mr. Adachi and Mr. Murakami returned to the dig, and after 6 hours of further
excavation, found 5 fossil pieces including two rib segments totaling 30
cm in size. Around
3 p.m., they took the bones to the Hyogo Prefectural Human and Nature Museum in
Sanda City. They asked researcher Haruo
Saegusa to examine them. Mr. Saegusa confirmed them to be dinosaur bones. All three hurried back to the discovery
location and checked how the bones were buried. Paleontologists have previously
noted the high potential of fossil discovery in the Sasayama layer bed, due to
the close similarity to the Tedori layer bed in the Hokuriku Region (Cretaceous
Period), location of the biggest discovery of dinosaur fossils in
| August 10,2006
Three museum staff attempted further site excavation, but determined digging
by hand was too limiting.
| September 27 to 29,2006
A trial dig, led by the museum took place for three
days. ten additional fossils were collected. After cleaning, a preliminary determination was that these
fossils were bones of a grass-eating dinosaur, Titanosaur, and teeth of a
| October 12,2006
Planning for a full scale excavation commenced with
| January 3,2007
Media release by the Human and Nature Museum, announced the fossil discovery
of the giant grass-eating dinosaur.
| January 11,2007
The Human and Nature Museum holds a press
conference at the discovery site, providing details of the find.