The Pleistocene period saw the formation of the quaternary rock system, which persisted until the Eocene. They have a high organic content due to their recent origin (fossils). These are mostly found in northern India's plains (Satluj-Ganga-Brahmaputra plains) as well as the Kare was of Kashmir valley. This article will explain to you about the Quaternary System which will be helpful in Geography preparation for the UPSC Civil service exam.

Quaternary System - Concept

• The Quaternary period is called after fairly recent deposits that include fossils of species that have current counterparts.
• The process started during the Pleistocene epoch (1 million years ago) and continues through the Holocene or Recent past.
• This epoch is represented by the alluvium found in the Indo-Gangetic plain.
• It also encompasses all of the recent alluvial deposits of the Indo-Gangetic plains in northern India.
• The earlier alluvium is known as Bhangar and is found above the flood level of the rivers.
• Khaddar, or newer alluvium, is restricted to river channels and floodplains.
• As new silt is deposited down by the rivers every year, this region contains some of the most productive soil in the country.

Quaternary System - Formation

• These rocks may be found in the Indus and Ganga plains.
• The Quaternary era is separated into two chronological periods: the Pleistocene and the Holocene.
• During the Upper and Middle Pleistocene eras, ancient alluvial soil is known as 'bangar' was produced.
• The creation of alluvial soil began at the end of the Pleistocene epoch and continues to this day in the Holocene period. It is referred to as khadar.
• During the Pleistocene epoch, the Kashmir valley developed.
• Originally, this valley was a lake. The current shape (valley) is known as 'kareva' due to the constant deposition of material.
• The Pleistocene deposition has been discovered in the Thar Desert. The 'Rann of Kachchh' used to be a part of the ocean.
• During the Pleistocene and Holocene epochs, sedimentary sediments filled it.

Quaternary System - India

• These are mostly found in the plains of north India (Satluj-Ganga-Brahmaputra plains) and also in the Kare was of Kashmir valley (Lucusterine and Moraine deposits).
• During the Pleistocene epoch, human culture and a worldwide variety of infaunal (Birds, Mammals) and floral assemblages occurred.
• During this time, five significant glacial events (Gunj, Mindel, Riss, Wurm) occurred.
• In addition to these, geological traces of the Holocene period may be found in various parts of India.
• Occurring along the banks of the Brahmaputra river The alluvial deposits of this era may be found in the deltaic zones of important rivers like the Cauvery, Krishna, Mahanadi, and Ganges.
• The formation of Mesolithic human civilization in India around 20,000 years before Christ has been attributed to the post-glacial climate.
• The geology of India reveals a wealth of information about the continent and its evolution.

Pleistocene era

• The Pleistocene era is a geological time period that encompasses the last ice age when glaciers covered vast areas of the world.
• The Pleistocene lasted approximately 2.6 million years and ended 11,700 years ago.
• The Pleistocene epoch was succeeded by the Holocene epoch, which we are currently living in now, and is part of a broader time period known as the Quaternary period (2.6 million years ago to the present).

Conclusion

The Quaternary epoch is named for relatively recent deposits that include fossils of present species. The process began during the Pleistocene period (1 million years ago) and continues through the Holocene epoch. The alluvium discovered in the Indo-Gangetic plain represents this period. The Pleistocene epoch was replaced by the Holocene epoch, which is now part of a larger time period known as the Quaternary period.

FAQs

Question. What is the Quaternary System?

Question. What are the key characteristics of the Quaternary period?

Question. How did the Quaternary System impact Earth's climate?

Question. What are the major stages of the Quaternary period?

Question. What are the geological formations associated with the Quaternary period?

MCQs

1. What is the geological time span of the Quaternary period?

A) 1 million years

B) 10 million years

C) 2.6 million years

D) 50 million years

2. Which epoch of the Quaternary period is characterized by the ice ages?

A) Pleistocene

B) Holocene

C) Eocene

D) Miocene

3. The rise of Homo sapiens occurred during which epoch of the Quaternary?

A) Pleistocene

B) Holocene

C) Miocene

D) Devonian

4. What major environmental event occurred at the end of the Pleistocene epoch?

A) Rise in global sea levels

B) Ice ages and the spread of glaciers

C) Extinction of megafauna

D) Formation of desert regions

5. Which of the following is NOT a characteristic of the Holocene epoch?

A) The development of human civilizations

B) Warming of the global climate

C) The spread of ice sheets across the Earth

D) The formation of modern landscapes

GS Mains Questions and Model Answers

Q1: Examine the geological significance of the Quaternary period and its impact on Earth's landscape.

Answer: The Quaternary period is of immense geological significance as it marks the most recent phase in Earth’s geological history, lasting from 2.6 million years ago to the present. The period is defined by climatic fluctuations, notably the ice ages, which had a profound impact on Earth’s landscapes. During the Pleistocene epoch, large ice sheets covered much of North America, Europe, and Asia, causing significant erosion and the formation of glacial landforms such as moraines, drumlins, and glacial valleys. The retreat of these ice sheets led to the creation of many modern features like lakes, river valleys, and sedimentary deposits. Additionally, the Quaternary saw the evolution of Homo sapiens and other species, which contributed to changes in the Earth’s environment. In terms of tectonic activity, the Quaternary was also marked by the continued movement of tectonic plates, forming mountain ranges and altering the landscape.

Q2: Discuss the climatic changes during the Quaternary period and their effects on global ecosystems.

Answer: The Quaternary period was characterized by significant climatic changes, primarily the ice ages of the Pleistocene epoch followed by the warmth of the Holocene. During the Pleistocene, the Earth underwent repeated cycles of glaciation and interglacial periods, where the climate oscillated between cold, glacial phases and warmer interglacial phases. These fluctuations had profound effects on global ecosystems, as species adapted to the changing climate or became extinct. The expansion of ice sheets during glacial periods led to lower sea levels, the formation of land bridges, and the migration of species to new regions. As the climate warmed in the Holocene, ecosystems adapted to new conditions, and species distributions shifted. The spread of forests in northern latitudes and the emergence of human civilizations during the Holocene transformed ecosystems further, with humans impacting landscapes through agriculture, deforestation, and urbanization.

Q3: Analyze the role of the Quaternary period in the development of human civilization.

Answer: The Quaternary period played a crucial role in the development of human civilization, beginning with the emergence of Homo sapiens in the Pleistocene epoch. As the climate fluctuated between glacial and interglacial periods, early humans adapted to various environments, developing tools, hunting strategies, and eventually agricultural practices. The end of the ice ages in the Holocene epoch brought about a warmer and more stable climate, which facilitated the rise of agriculture, the domestication of animals, and the establishment of permanent settlements. This led to the development of complex societies and the advent of urbanization. The Holocene also saw the rise of major civilizations, including those in the Mesopotamian, Indus Valley, and Egyptian regions, which laid the foundation for modern technological, cultural, and political advancements. The Quaternary period, therefore, represents the time when early humans transitioned from hunter-gatherer societies to settled agricultural communities, leading to the development of global civilizations.

Previous Year Questions on Quaternary System

1. UPSC 2020

Question: "Discuss the climatic changes during the Quaternary period and their impact on global ecosystems."

Answer: This question required an analysis of the climatic fluctuations during the Quaternary period, specifically the Pleistocene and Holocene epochs, and how they shaped global ecosystems.

2. UPSC 2019

Question: "Examine the role of the Quaternary period in shaping human civilization."

Answer: This question focused on how the Quaternary period, through climatic and environmental changes, influenced the development of human civilization, including agriculture and urbanization.