Skandapurana 16.223.5

16.223.5

rahasyaṃ paramaṃ devi tīrthānāṃ pravaraṃ hi tat..
pūrvaṃ kṛtayuge devi pretatīrthaṃ ca saṃsmṛtam ..
kalau yuge tu saṃprāpte gātrotsargamiti tvabhūt .. 5 ..

It is a supreme mystery, O goddess, the most excellent of sacred fords.
Formerly in the Kṛta age, O goddess, it was remembered as Pretatīrtha;
but when the Kali age arrived, it became Gātrotsarga.