These are Jain Dharm terms for time. They don't believe in Hindu way of creation, sustenance and dissolution concept of universe and such cyclical nature of Genesis of creations. According to the Jain, Time is eternal and formless. It is understood as a wheel with 12 spokes (Are), the equivalent of ages, six of which form an ascending arc and six a descending one. In the ascending arc (Utsarpinee), humans progress in knowledge, age, stature, and happiness, while in the descending arc (Avasarpinee) they deteriorate. The two cycles joined together make one rotation of the wheel of time, which is called a Kalp. These Kalp repeat themselves without beginning or end. During the Avasarpinee half cycle, progress, development, happiness, strength, age, body, religious trends, etc. go from the best conditions to the worst. Presently, we are in the fifth Are of the Avasarpinee phase. When the Avasarpinee phase ends the Utsarpinee phase begins. This Kaalchakra repeats again and continues forever. The Jain world is uncreated and eternal. They believe each time a Teerthankar also will be born or will be responsible like Hindu's Manu for each Manvantar.

24000 years Ayanaabda Yug, indicated in Vaayu Puraan, has 2 parts of 12,000 years each Ava-Sarpinee starts with Satya - Tretaa - Dwaapar -Kali Yug, and Utsarpinee in reverse order. Actual glacial cycle in history is closer to Indian value of 24,000 years. Swaayambhuv Manu was after glacial flood of 31,000 BC in 29,102 BC-26,000 years before Kali Yug beginning (Brahmaand Puraan). 11th Vyaas Rishabh Dev was just after second glacial flood in 10,000 BC. Before that, it was period of Vaivaswat Yam.
Arun Upadhyay
It does not seem to be true.