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5 entries under geohistory topic. ×

1
paleocene geology(expression, geology, formation)
0
cretaceous-paleogene boundary(expression, geology, formation)
0
paleogene geology of north dakota(expression, north, formation, dakota)
0
paleogene montana(expression, formation, montana)
0
paleogene system of north america(expression, america, formation)
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APASmart Define. (1970). hell creek formation thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hell_creek_formation/thesaurus/broader
ChicagoSmart Define. 1970. "hell creek formation thesaurus" https://smartdefine.org/hell_creek_formation/thesaurus/broader (accessed September 30, 2026).
HarvardSmart Define 1970, hell creek formation thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hell_creek_formation/thesaurus/broader>.
MLASmart Define. "hell creek formation thesaurus" 1 January 1970. Web. 30 September 2026. <https://smartdefine.org/hell_creek_formation/thesaurus/broader>