Sarcophagus used in a wall

PHOTOGRAPHER:  (Paris, France)   |   CAMERA:    |   LENS:    |   MEDIA: 

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This curiosity can be found on the road going downwards from the Saint Nectaire church. A series of sarcophagus seem to have been used in the construction of the wall underneath the church. I could not find the reason of this curious building method, nor explanations about the origin of these sarcophagus.