try using a shovel to dig in clay 4' into
the ground
for more than 15 minutes at a time without someone spelling you off.
Four feet of clay! Wow. The only negative I see with that is drainage.
At Heartwood, the typical dig is one inch of soil and the rest of
various-sized rocks from half-inch to eighteen inches.
The first garden fence, which became the outer fence of the chicken
moat, was of cedar posts. It is highly likely that I will never set
another wood post. Even driving steel T-posts can be a challenge
necessitating withdrawing and moving to the side a bit.