D e f i n i t i o n s . Anthropogene. (From the Greek word “ anthropos ” – the Human). It is the historical period of the Human evolution, when the Human appearance and development, both ancient and modern, took place. This period includes Pleistocene and Holocene. It’s duration is evaluated from 700 thousand years up to 2-3,5 million years, it last up to now. Glacial Epoch. It is the geological period of the Earth evolution. It is a part of the Ice Age. The Ice Age proper consisted of stages of the growths of glaciers (temperature decreases) and the decreases of glaciers (temperature increases). The growths of glaciers (temperature decreases) are named   "Glacial Epochs" and the decreases of glaciers (temperature increases) are named " Interglacial Epochs", and their "pairs" are named " Glacial- Interglacial Cycles". We live in the modern Glacial Epoch which began approximately 10 thousand years ago. The last Glacial Epoch began approximately 115 thousand years ago and completed approximately 10 thousand years ago. Glacial- Interglacial Cycle. It is a part of the Ice Age. The Ice Age proper consisted of stages of the growths of glaciers (temperature decreases) and the decreases of glaciers (temperature increases). The growths of glaciers (temperature decreases) are named  "Glacial Epochs" and the decreases of glaciers (temperature increases) are named " Interglacial Epochs", and their "pairs" are named " Glacial- Interglacial Cycles". Ice Age. It is the geological period of the Earth evolution. Scientists name it also Pleistocene, Anthropogene and Quaternary Age. These titles reflect features of this period. The cold stages of the Earth history lasted during ten million years are named " Ice Ages". The modern ice age began approximately 3,5-2 million years ago and lasts up to now. Interglacial Epoch. It is a part of the Ice Age. The Ice Age proper consisted of stages of the growths of glaciers (temperature decreases) and the decreases of glaciers (temperature increases). The growths of glaciers (temperature decreases) are named  "Glacial Epochs" and the decreases of glaciers (temperature increases) are named " Interglacial Epochs", and their "pairs" are named " Glacial- Interglacial Cycles". Palaeolithic Age. (From the Greek word “palaios” - ancient), the early stone age. It is the historical period of the Human evolution. The name reflects the feature of this period. It was the Mankind developing. This period lasted from the beginning of Pleistocene up to Holocene, i.e. during almost the whole Anthropogene. It lasted from appearance of the ancient Human (approximately 2000 -700 thousand years ago) up to 10 thousand years ago. It was the first period of the Stone Age. Pleistocene. From the Greek word “pleistos” – the greatest. It is the most long epoch of the Quaternary Age (approximately from 700 up to 10 thousand years ago). It’s features were general falling of the climate temperature and periodic growth of the extensive continental icing. Quaternary Age. It is the geological period of the Earth evolution, that lasted up to now. It is subdivided into Pleistocene and Holocene. It’s duration is evaluated from 700 thousand years up to 3,5-2 million years. Other names are Anthropogene, Ice Age. Holocene. (From the Greek word “ holos ” – the whole). It is the modern geological period of the Earth evolution, that is the last not ended part of the Quaternary Age. It began about 10 thousand years ago and lasts up to now.