Reference for Bava Batra 206:3

בעי רב פפא מופסק עפר בינתים מהו תיקו בעי רב אשי עפר מלמטה וצונמא למעלה עפר מלמעלה וצונמא מלמטה מהו תיקו:

[that rock might be]. R. Papa inquired: What [is the law if some] earth intervenes between [the rock and the boundary]? — The matter is undecided. R. Ashi inquired: What [is the law if] there was earth beneath<span class="x" onmousemove="('comment',' I.e., beneath the rock that lies near the border. ');">⁹</span> and rock above, [or] earth<span class="x" onmousemove="('comment',' Less than three handbreadths in depth, and insufficient for the depth required by the plough. ');">¹⁰</span> above and rock beneath?<span class="x" onmousemove="('comment',' Is the rock, in such cases as these, included in the measurements of the field or not? ');">¹¹</span>

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