Sandstone vs Arkose Characteristics Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Sandstone vs Arkose characteristics assist us to distinguish and recognize rocks.
The first such period is referred to as the Paleolithic, or Old Stone Age. The Old Stone Age began about 2 million years ago with the development of the first tools by Homo habilis and lasted until around 12,000 years ago.
The Old Stone Age began approximately 4.5 million years ago. It lasted until about 25 thousand years ago â relatively recently in terms of the overall age of the earth. It was at the beginning of the Old Stone Age, approximately 4.4 million years ago, that the first human ancestors made their appearance on earth.