Cob: wall cracks

[Roxboro Yurt]

I have searched the archives and can't seem to find
any info on wall cracking.  My cob walls (about 7 ft
high at this point) are starting to get little
fractures at the bottom in some places where the cob
is almost totally dry. Usually about three to four
inches long and very very narrow. They don't look too
serious, can anyone tell if this is par for the course
or something I should be worried about?

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