So that they were covered over by what they were covered over.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (so that there covered them that which did cover) i.e. stones covered them.
Jalāl al-Dīn al-Maḥallī
تفسير : so that there covered them, of rocks afterwards, that which covered [them]: this is [purposely] left vague in order to inspire terror; in [sūrat] hūd [it is stated]: we made their uppermost the nethermost, and we rained upon them stones of baked clay [q. 11:82].