Prehistoric Stone

Prehistory

Prehistory, sometimes referred to as pre-literary history, is the period of human history between the first known use of stone tools by hominins c. 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared c. 5,200 years ago. The adoption of writing across the globe was a gradual process, so that the end of prehistory occurred at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. The period when a culture is written about by others but has not developed its own writing system is often known as the protohistory of the culture.

Rock (geology)

In geology, a rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects.

prehistoric

Adjective

1. Of or relating to the epoch before written record.
2. Ancient; very old, outdated, etc.

stone

Noun

1. A hard earthen substance that can form rocks; especially, such substance when regarded as a building material.
2. A piece of such material: a block of stone, rock or a pebble.

Adjective

1. Constructed of stone.
2. Having the appearance of stone.