No.50 2015 pp.137 147 Education Note: Stratigraphic Survey Practice in and around Genji-yama Park in the City of Kamakura, in the Northern Part of Miura Peninsula, Central Japan: A guide for Observing the Miocene Pleistocene Miura and Kazusa Groups Hirokazu OZAWA and Yuriko NAKAO Received November 17, 2014 Representative strata with sedimentary structures and geological structures of the Miocene Pleistocene (ca. 6.0 2.4 Ma) Zushi and Ikego formations of the Miura Group and the Uragou Formation of the Kazusa Group are observable well in the northern part of the Miura Peninsula in and around Genji-yama Park of Kamakura City, Kanagawa Prefecture, central Japan. This area is suitable for a stratigraphic survey practice in the field excursion intended for college students, who are learners of geological surveying, because it provides easy access to outcrops of the strata. As a guide for observing strata with sedimentary structures and geological structures, this article presents a basic explanation of them of the Miura and Kazusa groups in this area, for college students who plan to obtain surveying practice with the aim of becoming science teachers at the junior or senior high-school level in the near future. Keywords: Miocene Pleistocene, Miura and Kazusa groups, Miura Peninsula, central Japan, stratigraphic survey practice, field excursion, sedimentary rocks, geological structures, college students, science teachers 1 2010 2010a 2010b 2014 TV 1987 1998 2014 2003 2010 2012 2014 1 252-0880 1866 156-8550 3-25-40 Earth Sciences Laboratory, College of Bioresource Sciences, Nihon University: 1866, Kameino, Fujisawa, Kanagawa 252-0880, Japan Department of Geosystem Sciences, College of Humanities and Sciences, Nihon University: 3-25-40, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan 137 69

1 1 5 1 3 1 4 3 4 1 1 粒径 (mm) 256 64 粒子名巨レキ 大レキ 中レキ 人頭大 こぶし大 レキ ( 礫 ) 1 1 1988 1992 1998 2000 2003 2008 2010 2010 2012 2012 2014 1 5 1 4 2 1 1 /2 (0.500) 1 /4 (0.250) 1 /8 (0.125) 1 /16 (0.063) 1 /256 (0.004) 細レキ 極粗粒砂 粗粒砂中粒砂 細粒砂極細粒砂 シルト 粘土 砂 泥 ゴマ粒大 ざらつく ざらつかない 5 1 5 1 A 1 2 4 5 Wentworth 1922 3 2mm 2mm 1 16mm 0.063mm 1 16mm 0.063mm 5 5 Wentworth, 1922 2010 1 1 2 3 5 2 6 5 1 B 1 3 1 2 1 2 5 141 73

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