Matsya Purana — Manifestation of Kauśikī
निमित्तमेतद्विख्यातं वीरकस्य शिलोदये सो ऽभवत्प्रक्रमेणैव विचित्राख्यानसंश्रयः //
nimittametadvikhyātaṃ vīrakasya śilodaye so 'bhavatprakrameṇaiva vicitrākhyānasaṃśrayaḥ //
This well-known incident became the determining cause for Vīraka in the matter of Śilodaya; and, in due course, it grew into the basis of a wondrous narrative episode.
This verse does not address Pralaya directly; it explains narrative causality—how a known ‘nimitta’ becomes the trigger for a later episode connected with Śilodaya and Vīraka.
Indirectly, it reflects a Purāṇic teaching method: ethical and political lessons are often introduced through ‘nimitta’ (a causative incident) that unfolds into an exemplary story—implying that actions and circumstances generate consequential outcomes over time.
No explicit Vāstu or ritual rule appears in this verse; ‘Śilodaya’ literally evokes ‘stone’s emergence,’ but here it functions as a named topic/episode rather than a stated architectural prescription.