The University Museum
The University of Tokyo

Bulletin No.18

SEASONAL DATING BY GROWTH-LINE COUNTING OF THE CLAM, MERETRIX LUSORIA

Hiroko KOIKE

1980 TOKYO

CONTENTS

Introduction

Acknowledgements

Part I. Seasonal Dating Method

I. Historical Review of the Study of Growth Increments

II. Shell Structure and Growth Increments of Meretrix lusoria (Röding)

	II-1. Growth Increments and Growth Lines
	II-2. Methods of Observation
	II-3. Microstructure of Growth Increments
	II-4. Discussion

III. Daily Formation of Growth Lines

	III-1. Vital Staining Experiment
	III-2. Daily Growth Increments
	III-3. Subdaily Growth Lines
	III-4. Identification of Daily Growth Lines

IV. Annual Pattern of Daily Growth Increments

	IV-1. Annual Patterns of Daily Growth Increments
	IV-2. Multivariate Analysis of the Relationship between the Annual Growth Pattern and Environmental Factors
	IV-3. Time Series Analysis for the Relationship between the Tidal Cycle and the Cyclic Growth Pattern
	IV-4. Recognition of the Annual Growth Minimum

V. Shell Growth and Growth-Line Analysis

	V-1. Life History of Meretrix lusoria
	V-2. Methods of Growth-Line Counting
	V-3. Growth Stage and Growth Curve of Meretrix lusoria Shells Examined by Growth-Line Analysis
	V-4. Conclusions

Part II. Seasonality of Shell-collecting Activities in Prehistoric Japan

I. Historical Review of Shell-Midden Studies in Japan

II. Materials and Methods

III. Description of Sites and Analytical Results

	III-1. Shimpata Site
	III-2. Kode Site
	III-3. Nishinoyato Site
	III-4. Kowashimizu Site
	III-5. Arayashiki Site
	III-6. Soya Site
	III-7. Miyamotodai Site
	III-8. Kamitakatsu Site
	III-9. Uenodai Site
	III-10. Natsumidai Site
	III-11. Kasai-jo Site
	III-12. Hitotsubashi Site

IV. Accumulation Speed of Shell Deposits and Seasonality of Shell-collecting Activities

Hiroko KOIKE: The University Museum, The University of Tokyo

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