Chopper

Japanese: チョッパー(英語表記)chopper
Chopper
A pebble tool made by chipping off a part of one side of a rounded or angular pebble to create a blade. There are two basic types of pebble tools: one-sided and two-sided. The former are called choppers and the latter chopping tools. They are found in the lowest layers of the Olduvai site in East Africa, and make up the majority of Early and Middle Paleolithic stone tools in East and Southeast Asia. However, in some areas, this tradition can also be seen in the Neolithic period.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
円礫あるいは角礫の片面の一部分を打欠いて刃部とした礫器。礫器の基本形式に,片面加工と両面加工が区別されるが,前者はチョッパー,後者はチョッピング・トゥールと呼ばれている。東部アフリカのオルドバイ遺跡では最下層にみられ,東アジアおよび東南アジアでは前・中期旧石器時代石器の主体をなしている。ただし地域によってはこの伝統は新石器時代にもみられる。

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