| 31. | Fountain Formation was formed during the Pennsylvanian period of the Paleozoic era, 290 296 million years ago.
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| 32. | Eventually, in the Paleozoic Era, plants emerged onto land, and have continued to flourish up to the present.
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| 33. | The rocks from the northern portion of the watershed date to the Precambrian Era and Lower Paleozoic Era.
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| 34. | The Cordillera Central formed from the Guyana shield during the Paleozoic era with intrusions from granite and metamorphism.
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| 35. | A crystalline basement formed at the beginning of the Paleozoic era, between 540 and 360 millions years ago.
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| 36. | In the Paleozoic Era, the ocean deposited a thick layer of marine sediments which left behind sedimentary rock.
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| 37. | In the Paleozoic era, brittle stars had open ambicular grooves, but in modern forms, these are turned inward.
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| 38. | The town hosts the Panadhro Geological Museum which holds in display fossils of Paleozoic era found in these mines.
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| 39. | The Permian spanned from 299 to 252 million years ago and was the last period of the Paleozoic Era.
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| 40. | It is hypothesized that mycoplankton evolved from terrestrial fungi, likely in the Paleozoic era ( 390 million years ago ).
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