This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Resembling rubble.

adj. Strewn with rubble.

adj. Relating to, or containing, rubble.

Abounding in small irregular stones; containing or consisting of rubble.

Of the nature of rubble, or coarse irregular masonry.

"An aquifer may be a layer of gravel or sand, a layer of sandstone or cavernous limestone, a rubbly top or base of lava flows, or even a large body of massive rock, such as fractured granite, that has sizable cracks and fissures."

algae-based    oil-bearing    shingly    cindery    fern-covered