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2
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Of a geologic era within the Phanerozoic eon that comprises the Triassic, Jurassic and Cretaceous periods
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4
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(geology) of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs fr
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7
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Of a geologic era within the Proterozoic eon; comprises the Tonian, Cryogenian and Ediacaran periods
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9
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Of or from the geologic strata above the Permian and below the Jurassic
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10
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Of, or relating to the geologic eon from about 2,500 to 570 million years ago;
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12
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Of a geologic period within the Cenozoic era; comprises the Miocene, Pliocene, Pleistocene and Holocene epochs
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14
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of a geologic period within the Paleozoic era; comprises the lower, middle and upper Mississippian and lower, middle and upper Pennsylvanian epochs
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16
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(geology) Of a geologic period within the Neoproterozoic era from about 850 to 600 million years ago.
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18
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Relating to the eons before the Phanerozoic
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19
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Of, or relating to the geologic eon from about 570 million years ago to the present; comprises the Paleozoic, Mesozoic and Cenozoic eras.
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20
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The geologic period within the Mesozoic era that comprises lower and upper epochs
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22
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Of a geologic period within the Paleozoic era; comprises the Cisuralian, Guadalupian and Lopingian epochs
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23
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Of or pertaining to the second period of the Mesozoic era, a time still dominated by dinosaurs.
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1
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Of a geologic period within the Cenozoic era; comprises the Paleocene, Eocene and Oligocene epochs
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3
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Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs
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5
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a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
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6
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is a commonly used word for long period of time.
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8
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a span of time smaller than a period and larger than an age
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11
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Of a geologic era within the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods
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13
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Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.
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15
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Of a geologic period within the Paleozoic era; comprises the Llandovery, Wenlock, Ludlow and Pridoli epochs
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16
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Of a geologic era within the Phanerozoic eon comprising the Paleogene and Neogene periods
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17
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Million years ago.
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20
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of a geologic period within the Paleozoic era; comprises lower, middle and Furongian epochs from about 542 to 490 million years ago
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21
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Of a geologic period within the Neoproterozoic era from about 620 to 542 million years ago.
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