301 ► Oregon, Wheeler County, Mitchell — Painted by the Past — Changing Forest —

302 ► Oregon, Wheeler County, Mitchell — Painted Hills Overlook — John Day Fossil Beds National Monument —

303 ► Pennsylvania, Allegheny County, Pittsburgh, North Oakland — Diplodocus carnegii —

304 ► Pennsylvania, Allegheny County, Pittsburgh, South Side Flats — Prehistoric Rivers — Three Rivers Heritage Trail —

305 ► Pennsylvania, Allegheny County, Pittsburgh, Squirrel Hill South — Frick Family —

306 ► Pennsylvania, Allegheny County, Pittsburgh, Troy Hill — Historic Site —

307 ► Pennsylvania, Clearfield County, Clearfield — Cast of Trunk from Prehistoric Tree —

308 ► Pennsylvania, Crawford County, Conneaut Lake, Sadsbury Township — Geology —

309 ► Pennsylvania, Crawford County, Titusville — Titusvillia Drakei Caster —

310 ► Pennsylvania, Jefferson County, Brookville — Park Geology — Scripture Rocks Heritage Park —

311 ► Pennsylvania, Lackawanna County, Scranton — Sigillaria Fossil —

312 ► Pennsylvania, Lancaster County, Millersville — Atlas Cedar — Cedrus atlantica — University Trees of Distinction —

313 ► Pennsylvania, Monroe County, Marshalls Creek — Marshalls Creek Mastodon —

314 ► Pennsylvania, Philadelphia County, Philadelphia, Fitler Square — Edward Drinker Cope —

315 ► Pennsylvania, Philadelphia County, Philadelphia, Logan Square — Connecting People to Nature — Parkway Museums District —

316 ► Pennsylvania, Philadelphia County, Philadelphia, William Penn Annex East — Peale’s Mastodon, 2017 — American Philosophical Society Museum — Reported permanently removed

317 ► South Dakota, Custer County, Wind Cave National Park — Exposing the Past —

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318 ► South Dakota, Custer County, Wind Cave National Park — Wind Cave National Park —

319 ► South Dakota, Fall River County, Edgemont — Petrified Tree —

320 ► South Dakota, Fall River County, Hot Springs — Late Mesozoic Era — ~100 million years ago —

321 ► South Dakota, Fall River County, Hot Springs — 680 — Mammoth Site of Hot Springs, SD —

322 ► South Dakota, Fall River County, Hot Springs — Mid-Cenozoic Era — ~35 million years ago —

323 ► South Dakota, Fall River County, Hot Springs — Paleozoic Era — ~540 to 250 million years ago —

324 ► South Dakota, Fall River County, Hot Springs — Paleozoic-Mesozoic Era — ~252 million years ago —

325 ► South Dakota, Fall River County, Hot Springs — Pleistocene Epoch — 140,000 years ago —

326 ► South Dakota, Fall River County, Hot Springs — Precambrian Era — ~4.5 billion to 540 million years ago —

327 ► South Dakota, Harding County, Buffalo — Harding County, South Dakota —

328 ► South Dakota, Jackson County, Interior — A 75-Million-Year Walk —

329 ► South Dakota, Jackson County, Interior — Anatomy of a Badland —

330 ► South Dakota, Jackson County, Interior — Bands of Time —

331 ► South Dakota, Jackson County, Interior — Dying to Become a Fossil —

332 ► South Dakota, Jackson County, Interior — It's a Dog's Life —

333 ► South Dakota, Jackson County, Interior — See Ya Later, Alligator —

334 ► South Dakota, Jackson County, Interior — Titanic Discovery —

335 ► South Dakota, Jackson County, Interior — Under the Sea —

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336 ► South Dakota, Jackson County, Interior — What a Find! —

337 ► South Dakota, Jackson County, Wall — Fight for Survival —

338 ► South Dakota, Meade County, Faith — Sue —

339 ► South Dakota, Minnehaha County, Sioux Falls — Inland Seas —

340 ► South Dakota, Pennington County, Rapid City — Apatosaurus — (Apatosaurus louisae) — Then and Now —

341 ► South Dakota, Pennington County, Rapid City — Dimetrodon — (Dimetrodon limbatus) — Then and Now —

342 ► South Dakota, Pennington County, Rapid City — Protoceratops — (Protoceratops andrewsi) — Then and Now —

343 ► South Dakota, Pennington County, Rapid City — Stegosaurus — (Stegosaurus stenops) — Then and Now —

344 ► South Dakota, Pennington County, Rapid City — The Great Race/Black Hills Geology —

345 ► South Dakota, Pennington County, Rapid City — Trachodon — (Trachodon mirabilis) — Then and Now —

346 ► South Dakota, Pennington County, Rapid City — Triceratops — (Triceratops horridus) — Then and Now —

347 ► South Dakota, Pennington County, Rapid City — Tyrannosaurus Rex — (Tyrannosaurus Rex) — Then and Now —

348 ► South Dakota, Pennington County, Rockerville — "Great Unconformity" Geology —

349 ► South Dakota, Pennington County, Wall — Ammonites —

350 ► South Dakota, Pennington County, Wall — Brontothere —

351 ► South Dakota, Pennington County, Wall — Hoplophoneus —

352 ► South Dakota, Pennington County, Wall — Mesoreodon —

353 ► South Dakota, Pennington County, Wall — Mosasaur —

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354 ► South Dakota, Pennington County, Wall — Plant Fossils —

355 ► South Dakota, Pennington County, Wall — Welcome to the National Grasslands —

356 ► Tennessee, Davidson County, Nashville, North Capitol — Ice Age Elephant — Prehistory —

357 ► Tennessee, Hardin County, Savannah — The Lost Petrified Forests of Savannah, Tennessee —

358 ► Tennessee, Hardin County, Shiloh — A Major River Town —

359 ► Tennessee, Sumner County, Castalian Springs — Bledsoe's Lick — Ice Age to World War II —

360 ► Tennessee, Washington County, Johnson City — The Limestone Cave —

361 ► Tennessee, Washington County, Johnson City — Trail Geology —

362 ► Texas, Bandera County, Bandera — Alamosaurus — Alamo Lizard —

363 ► Texas, Bandera County, Bandera — Deinonychus — Terrible Claw —

364 ► Texas, Bandera County, Bandera — Dilophosaurus — Double-crested Lizard —

365 ► Texas, Bandera County, Bandera — Gastornis — Gaston's Bird —

366 ► Texas, Bandera County, Bandera — Giganotosaurus — Giant Lizard of the South —

367 ► Texas, Bandera County, Bandera — Indricotherium — Indric Beast —

368 ► Texas, Bandera County, Bandera — Mastodon —

369 ► Texas, Bandera County, Bandera — Pachycephalosaurus — Thick-headed Lizard —

370 ► Texas, Bandera County, Bandera — Smilodon — Knife tooth —

371 ► Texas, Bandera County, Bandera — Stegosaurus — Roofed Lizard —

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372 ► Texas, Bandera County, Bandera — Torosaurus — Pierced Reptile —

373 ► Texas, Brazoria County, Clute — 14211 — Mammoth Lake —

374 ► Texas, Brewster County, Big Bend National Park — Ancient Swamp Creatures — Big Bend National Park —

375 ► Texas, Hale County, Plainview — 1228 — Discovery Site of the Plainview Point — (200 yards SE) —

376 ► Texas, Hunt County, West Tawakoni — 7811 — Lake Tawakoni —

377 ► Texas, Kendall County, Boerne — 749 — Cascade Cavern —

378 ► Texas, Roberts County, Miami — 2039 — Fossil Beds — (three miles southeast) —

379 ► Texas, San Patricio County, Ingleside — 13849 — Late Pleistocene Ingleside Fauna —

380 ► Texas, Somervell County, Glen Rose — A Story in Stone —

381 ► Texas, Somervell County, Glen Rose — An Ancient Story —

382 ► Texas, Somervell County, Glen Rose — Ancient Secrets Revealed —

383 ► Texas, Somervell County, Glen Rose — Apatosaurus — "deceptive lizard" —

384 ► Texas, Somervell County, Glen Rose — Deep Water Shelter —

385 ► Texas, Somervell County, Glen Rose — Dinosaur Footprint —

386 ► Texas, Somervell County, Glen Rose — 1226 — Dinosaur Tracks —

387 ► Texas, Somervell County, Glen Rose — Dinosaurs —

388 ► Texas, Somervell County, Glen Rose — Fossil Tracks —

389 ► Texas, Somervell County, Glen Rose — Making a Dinosaur —

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390 ► Texas, Somervell County, Glen Rose — Misleading Models —

391 ► Texas, Somervell County, Glen Rose — Roland T. Bird - Dinosaur Hunter —

392 ► Texas, Somervell County, Glen Rose — Sign of Ancient Times —

393 ► Texas, Somervell County, Glen Rose — Tyrannosaurus rex — "king tyrant lizard" —

394 ► Texas, Somervell County, Glen Rose — World's Fair Wonders —

395 ► Texas, Ward County, Monahans — 3434 — Monahans Sandhills State Park and Museum —

396 ► Texas, Williamson County, Leander — 9260 — Leanderthal Lady —

397 ► Utah, Garfield County, Escalante — Conserving Wildness — National Treasure —

398 ► Utah, Garfield County, Panguitch — Red Canyon Tunnels — Gateway to Natural Wonders —

399 ► Utah, Grand County, Crescent Junction — Copper Ridge Dinosaur Tracksite —

400 ► Utah, Grand County, Moab — A spring morning 112 million years ago... —

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