Where does “Leptolithic” come from?

Leptolithic (English) comes from Ancient Greek λεπτός, from Ancient Greek -τός, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Leptolithic (English): Upper Paleolithic

Definitions

Upper Paleolithic

Ancestry of “Leptolithic”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	λεπτός	peeled, husked; fine-grained; thin, lean
2	Ancient Greek	-τός	creates verbal adjectives of possibility, either...
3	Proto-Indo-European	-tós	Creates verbal adjectives from verb stems

Every word from Proto-Indo-European -tós →Every word from Ancient Greek -τός →Every word from Ancient Greek λεπτός →