Matsyapurana 144.87

144.87

jātamātreṣvapatyeṣu tataḥ kṛtamavartata
yathā svarge śarīrāṇi narake caiva dehinām //

After eating up all the birds and fish, etc, that were left during the period of Sandhyâmsa, people began to eat roots and fruits (Kandamûla, etc) They did not build their houses but covered themselves with barks of trees They had no treasures and they slept on ground They all perished in that plight and only a handful of them who survived, struggled on for a century They got sufficient food and got nourished The period of Kali's Sandhyâmsa lasts like that for a Divine century After this period, the men and women that were left began to produce many children With the advent of these children enters again the Satyayuga All the previous people, the remnants of the Kali pass away As the people reap the fruits of their actions in heaven and hell, similarly, the persons in Satyayuga enjoy happiness or suffer pain Thus Kaliyuga disappears and Satyayuga steps in—80 87