Reference for Chullin 253:11

ואי משום על הארץ על הארץ יטמא ירד לים לא יטמא

But is not the expression 'upon the earth' required to exclude a floating uncleanness where there is a doubt [concerning contact]?<span class="x" onmousemove="('comment',' I.e., if a dead reptile was floating upon the water and there arose a doubt as to whether or not it had come into contact with some object, even if the doubt arose in a private domain (in which case the established rule is that the state of doubt is resolved according to its more stringent aspect. i.e., unclean) , the object remains clean. This is deduced from the strict interpretation of the expression 'upon the earth'. V. Nazir 64a.');">⁸</span>

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