The Billings Annual Meeting featured float trips down the Yellowstone River and field day at Pompeys Pillar, signed by William Clark on July 25, 1806 who named the rock after his pet name for Sacagawea’s toddler—Jean Baptiste Charbonneau.














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The Billings Annual Meeting featured float trips down the Yellowstone River and field day at Pompeys Pillar, signed by William Clark on July 25, 1806 who named the rock after his pet name for Sacagawea’s toddler—Jean Baptiste Charbonneau.