OSRS Drop Calculator › Unidentified rare fossil

Best way to farm Unidentified rare fossil

All 10 monsters that drop Unidentified rare fossil, ranked by realistic quantity per hour — not just drop rate. Change the seconds-per-kill for any monster to match your own speed.

Drop data: Unidentified rare fossil on the OSRS Wiki

Currently fastest method
Lobstrosity
0.4 / hr
Monster Drops (rarity · quantity) Avg/kill Sec/kill Kills/hr Qty/hr
Lobstrosity
Combat lvl 68
5/3,500 · 1
 1 per 700 kills 13 277 0.4
Hoop Snake
Combat lvl 19
3/3,500 · 1
 1 per 1,167 kills 8 450 0.4
Long-tailed Wyvern
Combat lvl 152 · Slayer 66
10/3,500 · 1
 1 per 350 kills 41 88 0.3
Taloned Wyvern
Combat lvl 147 · Slayer 66
10/3,500 · 1
 1 per 350 kills 42 86 0.2
Spitting Wyvern
Combat lvl 139 · Slayer 66
10/3,500 · 1
 1 per 350 kills 43 84 0.2
Ancient Zygomite (Fossil Island)
Combat lvl 109 · Slayer 57
7/3,500 · 1
 1 per 500 kills 34 106 0.2
Ancient Wyvern
Combat lvl 210 · Slayer 82
12/3,500 · 1
 1 per 292 kills 66 55 0.2
Deranged archaeologist
Combat lvl 276
12/3,500 · 1
 1 per 292 kills 68 53 0.2
Tar Monster
Combat lvl 132
5/3,500 · 1
 1 per 700 kills 41 88 0.1
Ammonite Crab
Combat lvl 25
3/3,500 · 1
 1 per 1,167 kills 26 138 0.1
How this is calculated: items/hr = (3600 ÷ seconds per kill) × average items per kill. Each monster's drop lines are listed as the wiki shows them (rarity · quantity); the average adds them all up, each as rarity × average quantity × rolls — so a guaranteed drop plus a rarer bonus drop both count. Drop rates and quantities come from the OSRS Wiki's community-verified drop tables. Seconds-per-kill is an editable estimate based on each monster's hitpoints and defence — your real speed depends on your stats and gear, so adjust it and your edits are remembered on this device. Rates marked ~ are approximate on the wiki.

Something wrong on this page?

Drop rates come from the OSRS Wiki and kill times are estimates, so mistakes happen. Tell us what's off and it'll be looked at.