The Law Code of Yājñavalkya 3.1.27

3.1.27

tathā hārīto 'pi na grāmābhimukhaṃ pretaṃ hareyuḥ iti | yadā tu proṣitamaraṇe śarīraṃ na labhyate tadāsthibhiḥ pratikṛtiṃ kṛtvā teṣām apy alābhe parṇaśaraiḥ śaunakādigṛhyoktamārgeṇa pratikṛtiṃ kṛtvā saṃskāraḥ kāryaḥ | āśaucaṃ cātra daśāhādikam eva, āhitāgniś cet pravasan mriyeta punaḥsaṃskāraṃ kṛtvā śavavad āśaucam iti (VaDh 4.37) vasiṣṭhasmaraṇāt || anāhitāgnis tu trirātram,

Likewise, Hārīta also says: "They should not carry the deceased facing the village." When, however, in death abroad the body is not obtained, then, having made an effigy with bones, or in the absence of those as well, having made an effigy with palāśa leaves and kuśa grass according to the manner taught in the domestic manuals of Śaunaka and others, the rite of cremation is to be performed. And ritual defilement in this case lasts ten days and the like, according to the traditional text of Vasiṣṭha: "If a keeper of sacred fires dies while away on a journey, having performed the rite again, there is ritual defilement just as for a corpse" (VaDh 4.37). For one who has not established sacred fires, however, it lasts three nights,