Jurassic

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  Cambrian

  The Cambrian is the first geological period of the Paleozoic era, lasting from 542 ± 0.3 million years ago to 488.3 ± 1.7 million years ago (ICS, 2004); it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedgwick, who...
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  Cretaceous

  The Cretaceous (pronounced /kriːˈteɪʃəs/), Latin language for "chalky", usually abbreviated K for its German translation Kreide (chalk), is a geologic period and system from circa 145.5 ± 4 to 65.5 ± 0.3 million years ago (Ma). In the geologic timescale, the Cretaceous follows on the Jurassic...
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  Cenozoic

  The Cenozoic (also Cænozoic or Cainozoic) Era (pronounced /ˌsiːnɵˈzoʊɪk/, /ˌsɛnəˈzoʊɪk/) (meaning "new life" (Greek καινός (kainos), "new", and ζωή (zoe), "life"), is the most recent of the three classic geological eras and covers the period from 65.5 million years ago to the present. It is marked...
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  Devonian

  The Devonian is a geologic period and system of the Paleozoic era spanning from 416 to 359.2 million years ago (ICS, 2004). It is named after Devon, England, where rocks from this period were first studied. During the Devonian Period, which occurred in the Paleozoic era, the first fish evolved...
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  Eocene

  The Eocene epoch, lasting from 55.8 ± 0.2 to 33.9 ± 0.1 Ma (million years ago), is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. The Eocene spans the time from the end of the Paleocene epoch to the beginning of the Oligocene epoch. The...
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  Holocene

  The Holocene is a geological epoch which began approximately 11 700 years ago (10 000 C years ago). According to traditional geological thinking, the Holocene continues to the present. The Holocene is part of the Neogene and Quaternary periods. Its name comes from the Greek words ὅλος (holos, whole...
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  Mississippian

  The Mississippian is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earliest/lowermost of two subperiods of the Carboniferous period lasting from roughly 359 to 318 Ma (million years ago). As with most other geochronologic units, the rock beds that define the...
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  Miocene

  The Miocene is a geological epoch of the Neogene period and extends from about 23.03 to 5.33 million years before the present (23.03 to 5.33 Ma). The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words μείων (meiōn, “less”) and καινός (kainos, “new”) and means "less recent"...
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  Mesozoic

  The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. The division of time into eras dates back to Giovanni Arduino, in the 18th century, although his original name for the era now called the "Mesozoic" was "Secondary" (making everything after, including the modern era, the ...
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  Ordovician

  The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago (ICS, 2004). It follows the Cambrian period and is followed by the Silurian period. The Ordovician, named after the Welsh tribe of the...