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. 2019 Oct 2;14(10):e0222680. doi: 10.1371/journal.pone.0222680

Table 3. Average weight of items with pits.

Object type mean (g) SD n
Mortar 2,361 3,141 73
PMP 663 271 35
Kulki 389 237 39
Quandong Stone 1,532 669 24
Axe 504 341 150
Blocksplitter 849 399 7

The large standard deviation (SD) of mortars is the result of a wide range that includes several exceptionally large items documented from locations along the Darling River.