Mark the site for later
From Fallen London Wiki
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From: Sort the Results of Excavation
There is something still in the ground. Perhaps it will take several sessions of excavation to reveal it fully.
Game Instructions: This will save your remaining discoveries for later.
Unlocked with 
Palaeontological Discovery (hidden)
Success
Safe and sound
Now all that remains is packing away and labelling the bones for future use.
