I bought a house from the trust of the original owners. it's 50 years old. they kinda let the yard go as they got older, so everything was overgrown and whatever planters or garden beds they had are long since eroded.
the soil here is adobe clay. I've excavated some areas of the yard and I've found what seems to be gravel paths and areas under a cap of about 4 to 6 inches of dirt. in some places it's obvious that the dirt could have come down off the hill behind my house. in other places the hill isn't anywhere close so the dirt was either purposely placed on top of the gravel or the dirt is the remains of planter beds.
is there any reason why someone would cap a layer of gravel with additional soil? given that the area here is adobe clay and it doesn't always drain that well it kinda makes sense that they'd install a more permeable layer under a top layer of soil. however, I don't really know anything about this. to me it looks like old gravel paths and areas that haven't been maintained for the last 10+ years.
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