Matsya Purana — Characteristics of Dvāpara and Kali Yugas
विस्तरेणानुपूर्व्याच्च नमस्कृत्य स्वयम्भुवे प्रवृत्ते तु ततस्तस्मिन् पुनः कृतयुगे तु वै //
vistareṇānupūrvyācca namaskṛtya svayambhuve pravṛtte tu tatastasmin punaḥ kṛtayuge tu vai //
Then, having paid homage to Svayambhū (Brahmā) and having set forth the account in due sequence and in full detail, he continued; and in that course it was indeed said again that the Kṛta Yuga (Satya Yuga) returns once more.
It does not describe Pralaya directly; it signals a structured, sequential narration tied to cosmic time, specifically the (re)mention or return of the Kṛta Yuga within the Purāṇic chronology.
Indirectly: it models dhārmic transmission—beginning any authoritative teaching with reverence (namaskāra) to Brahmā and presenting tradition in orderly sequence—an ideal also expected in royal and household observances of śāstra.
No Vāstu or iconographic rule is stated; the ritual cue is the act of salutation (namaskṛtya) before commencing a formal exposition, reflecting Purāṇic/śāstric protocol.