| 31. | It lived from 501 to 497 million years ago during the Guzhangian of the late Cambrian Period.
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| 32. | It dates to the early Cambrian period, and is the earliest known fossil of the cephalochordate lineage.
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| 33. | Good evidence exists for the appearance of gastropods, cephalopods and bivalves in the Cambrian period } }.
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| 34. | Good evidence exists for the appearance of marine gastropods, cephalopods and bivalves in the Cambrian period } }.
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| 35. | The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period.
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| 36. | It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.
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| 37. | It lived from 501 to 497 million years ago during the Dresbachian faunal stage of the late Cambrian Period.
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| 38. | Isham Park is noted at its southern end for some exposed marble outcroppings which date from the Cambrian period.
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| 39. | It lived about from 501 to 497 million years ago during the Guzhangian faunal stage of the late Cambrian Period.
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| 40. | From the Cambrian Period, the Candana Quartzite is equivalent to the Herreria Formation and is 1 to 2 km thick.
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