NPCs composing that spawngroup :

fingered_skeleton (20%)

thick_boned_skeleton (80%)

NPCs spawning around that spawngroup :
(Max range : 100)

kurn_4, range=90 (15,-58,127)

an_odd_mole (100%)

kurn_8, range=96 (28,-61,4)

kurn_9, range=17 (0,13,3)

scalebone_skeleton (100%)

kurn_18, range=70 (-70,30,-39)

Burynai_excavator (100%)

kurn_34, range=59 (21,86,-116)

lesser_charbone_skeleton (100%)

kurn_44, range=9 (-9,29,-116)

kurn_57, range=95 (19,-63,134)

greater_scalebone (100%)

kurn_68, range=52 (22,-17,-118)

kurn_74, range=54 (38,70,-116)

kurn_91, range=37 (-30,8,-39)

kurn_92, range=88 (11,-57,-39)

kurn_93, range=85 (29,-50,-39)

Burynai_excavator (100%)

kurn_94, range=83 (67,-19,-39)

kurn_132, range=39 (-8,70,-39)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_133, range=68 (-51,77,-39)

kurn_134, range=88 (-84,61,-39)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_149, range=66 (-63,9,-30)

kurn_152, range=97 (-88,-11,-30)

kurn_153, range=74 (-62,-10,-30)

kurn_160, range=60 (-53,1,9)

greater_skeleton (100%)
greater_skeleton (100%)

kurn_166, range=50 (-50,39,104)

kurn_170, range=80 (22,-46,131)

kurn_183, range=74 (13,104,6)

greater_skeleton (100%)

kurn_184, range=90 (-85,61,106)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_185, range=58 (-39,-12,104)

kurn_186, range=84 (-58,-30,104)

kurn_187, range=45 (13,-13,104)

kurn_188, range=13 (-13,29,104)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_189, range=94 (93,48,104)

kurn_193, range=34 (-35,31,-39)

thick_boned_skeleton (100%)

#Crackling_Bones_189490, range=57 (-31,80,-39)

#Crackling_Bones (25%)
lesser_charbone_skeleton (75%)