However, water can and does enter the upper few feet of the shale through dehydration cracks, animal burrows, and the numerous small faults that formed when the original soft clay compacted into shale.
(water; can does enter; the upper few feet of the shale) (the numerous small faults; formed; T:when the original soft clay compacted into shale) (the original soft clay; compacted; into shale)
water the numerous small faults the original soft clay
can does enter formed compacted
the upper few feet of the shale
T:when the original soft clay compacted into shale
into shale