Agniveshyagrihyasutra 3.6.2.15

3.6.2.15

atha yadyasthīni na vindeta trayāṇāṃ ṣaṣṭiśatānāṃ parṇatsarūṇāmeva kṛṣṇājine puruṣākṛtiṃ kṛtvā teṣūpari pātrāṇi citvā kuśataruṇakaiḥ praticchādya prasiddhamupoṣeyuḥ \

Now, if one cannot find the bones, having made the shape of a man out of three hundred and sixty leaf-stalks of palāśa on a black antelope skin, having piled the sacrificial vessels on top of them, and having covered them with young kuśa shoots, they should burn him in the established manner.