▁in ▁ 2 0 1 4 , ▁with ▁scient ists ▁and ▁volunte ers ▁screen ing ▁soil ▁previously ▁removed ▁from ▁the ▁sink hole . ▁ ▁See ▁also ▁ ▁Ash fall ▁F oss il ▁B eds ▁ ▁Gray ▁F oss il ▁Site ▁ ▁List ▁of ▁foss il ▁sites ▁( with ▁link ▁directory ) ▁ ▁List ▁of ▁sink hol es ▁of ▁the ▁United ▁States ▁ ▁References ▁▁ ▁Far low , ▁James ▁O . ▁and ▁Anne ▁Arg ast , ▁Pres ervation ▁of ▁F oss il ▁B one ▁from ▁the ▁Pi pe ▁Creek ▁S ink hole ▁( L ate ▁Ne ogene , ▁Grant ▁County , ▁Indiana ▁U . S . A .), ▁Journal ▁of ▁the ▁Pale ont ological ▁Society ▁of ▁Korea , ▁ 2 2 ( 1 ): 5 1 - 7 5 , ▁ 2 0 0 6 . ▁ ▁Far low , ▁James ▁O . ▁et ▁al ., ▁ ▁New ▁Ver te br ate ▁F oss ils ▁from ▁the ▁Pi pe ▁Creek ▁S ink hole ▁( L ate ▁H emph ill ian , ▁Grant ▁County , ▁Indiana ) ▁P aper ▁No . ▁ 7 - 1 , ▁delivered ▁at ▁Ge ological ▁Society ▁of ▁America , ▁North - Cent ral ▁Section ▁- ▁ 3 8 th ▁Ann ual ▁Me eting ▁( A pril ▁ 1 – 2 , ▁ 2 0 0 4 ), ▁St . ▁Louis , ▁Missouri . ▁ ▁Far low , ▁James ▁O . ▁et ▁al ., ▁The ▁Pi pe ▁Creek ▁S ink hole ▁Bi ota , ▁a ▁D iverse ▁Late ▁T ert i