Skandapurana 5.230.10

5.230.10

etasminneva kāle tu sāṃkṛtirmunisattamaḥ..
guptaścakre tatastasyāṃ gartāyāṃ channavarṣmakaḥ..
yatra pūrvaṃ tapastaptaṃ vṛkeṇa ca dvijāḥ purā..6.231.10..

At that very time, Sāṅkṛti, the best of sages, / stayed in secret with his body concealed in that pit / where previously austerity had been performed by Vṛka, O twice-born.