Early Vadose Silt in Townsend Mound (Reef), New Mexico 1 2 3

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Abstract
Vugs, fractures, interstices, and other voids in the Townsend carbonate mound (reef) are floored with internal sediment composed of well sorted silt. Internal sedimentation predates precipitation of blocky cement, and postdates both precipitation of early drusy cement and early internal erosion. The silt differs from associated marine sediment in its scarcity of clay-size particles, sand-size particles, and recognizable skeletal debris. Age relationships and texture of the silt seem best explained as due to sedimentation inside preexisting crumbly rock in the vadose zone of an island during early emergence. If the explanation is valid, similar internal sediment might be a valuable clue to previously unrecognized subaerial stages in other carbonate mounds.

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