prehistoric technique of flintknapping, specifically the final shaping of a stone tool. - 火石 幅插畫檔、美工圖案、卡通及圖標
senior man working on flints and hammer flaking - engraving from 19th century illustrated book - 火石 幅插畫檔、美工圖案、卡通及圖標
senior man working on flints and hammer knapping - engraving from 19th century illustrated book - 火石 幅插畫檔、美工圖案、卡通及圖標
two specific geological materials—iron pyrites (left) and flint (right) found in the ash layers of ancient cave floors - 火石 幅插畫檔、美工圖案、卡通及圖標
myophoria laevigata is an extinct species of fossilized bivalve mollusk from the triassic period - 火石 幅插畫檔、美工圖案、卡通及圖標
daonella lommeli is a species of fossilized marine bivalve mollusk from the middle to late triassic period - 火石 幅插畫檔、美工圖案、卡通及圖標
avicula clarai is an extinct species of fossilized mollusk, specifically a bivalve, that lived in the triassic period - 火石 幅插畫檔、美工圖案、卡通及圖標
estheria minuta is a fossil species of a conchostracan, a type of bivalve-like crustacean - 火石 幅插畫檔、美工圖案、卡通及圖標
the fossil species, lima striata (plagiostoma striatum), is a fossil from the early jurassic period - 火石 幅插畫檔、美工圖案、卡通及圖標
"ammonites cassianus" refers to ammonites, specifically species like tirolites cassianus, found in the cassian formation, which dates to the late triassic period - 火石 幅插畫檔、美工圖案、卡通及圖標雕刻圖像, 復古風格
