In the two images below, note the lettering at the base of each visible headstone. The remaining writing is under the surface. There are two main reasons for this: The stone, due to soften ground from rain saturation, sank into the ground. The second cause is much more reasonable.
When a cemetery is left unattended, in this case for over thirty years, fallen debris, leaves and other material accumulate around the stone. Over time, these things decay and become mulch, also known as compost. Each yearly amount of mulch adds onto the previous amount.
When cemetery preservation work is first started, many headstones appear to have sunken into the ground when in reality, the ground rises up and over the headstone.
Image a surface grave marker, the ones that lay flat on the ground. Now, imagine having thirty or, more, years of mulch debris, covering the grave.
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