FOSSIL WOODS FROM THE MIOCENE IN THE YAMAGATA PREFECTURE, JAPAN

作者：Choi Sung Kook; Kim Kyungsik^*; Jeong Eun Kyoung; Terada Kazuo; Suzuki Mitsuo; Uematsu Houhei

来源：IAWA Journal, 2010, 31(1): 95-117.

DOI：10.1163/22941932-90000009

• Fossil wood
• Miocene
• Yamagata Prefecture
• Japan

Eighty-two silicified fossil woods were collected from Miocene formations oil the. western coast of the Yamagata Prefecture, Japan. Twenty-two taxa (5 conifers and 17 dicotyledons) were identified. Five new species (Chamaecyparis parathyoides, Pterocarya parvipora, Populus soyaensis, Schima protowalhchi, Lagerstroemia adamense) and two species not previously known from the Miocene of Yamagata are described. This brings the number of fossil wood taxa from the Miocene of Yamagata of 39 Warm temperature elements such as Keteleeria, Liquidambar, Distylum and Lagerstroemia were found in the formations studied. The fossil wood assemblages from four Miocene formations (except Onisakatouge Formation from which only one sample was collected) suggest that the woody flora changed gradually during the Miocene from a mixture of cool and warm temperate elements to a warm temperate assemblage. These changes agree well with the vegetation changes during the Miocene in Japan; from the Amar type to the Daijima-type.

• 出版日期2010