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| Algonkian |
of, relating to, or designating the later of two geological periods of the Precambrian Era, from approximately 2.5 billion to 600 million years ago, when the first evidence of life appeared; Late Precambrian; Proterozoic. [1/4 definitions] |
| ammonite1 |
any of various coiled, flat, chambered fossil shells of extinct cephalopod mollusks from the Mesozoic era. |
| Archean |
of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic. [1/2 definitions] |
| artifact |
any object made by human beings, esp. one of an earlier era. [1/2 definitions] |
| B.C.1 |
abbreviation of "before Christ" (used in designating dates in history, now usually replaced by "BCE," "before the common era"). |
| B.C.E. |
abbreviation of "before the common era" (used in designating dates in history). |
| Cambrian |
of, relating to, or designating the geological period at the start of the Paleozoic Era, from approximately 600 million to 500 million years ago, when marine animals such as trilobites were in abundance. [1/2 definitions] |
| carboniferous |
(cap.) of, relating to, or designating the geological time period between the Devonian and Permian of the Paleozoic Era, from approximately 350 million to 280 million years ago, when the warm damp climate produced many forests that later formed rich coal deposits. [1/3 definitions] |
| C.E. |
abbreviation of Common Era or Christian Era. |
| Cenozoic |
of, relating to, or designating the most recent geological era that includes the present and began approximately 70 million years ago, when many mammals appeared, the modern continents took shape, and glacial ice formed. [2 definitions] |
| Christian Era |
in Christianity, the era beginning at the birth of Jesus Christ, about 1 A.D. |
| Common Era |
see "Christian Era." |
| cretaceous |
(cap.) of, relating to, or designating the geological period at the end of the Mesozoic Era, from approximately 135 million to 65 million years ago, when dinosaurs died out, early mammals and flowering plants appeared, and chalk beds were formed. [1/2 definitions] |
| cycle |
a long time; age; era. [1/7 definitions] |
| Devonian |
of, relating to, or designating the geological period between the Silurian and the Carboniferous of the Paleozoic Era, from approximately 400 million to 350 million years ago, when large trees and amphibians appeared and fish were in great abundance. [1/2 definitions] |
| eponym |
an actual or mythical person whose name is the source of the name of a city, nation, era, or the like. |
| Gilded Age |
in U.S. history, the post-Civil War era, characterized by rapid industrialization, economic expansion, and widespread corruption in business and government. |
| Jurassic |
of, relating to, or designating the geological period between the Triassic and Cretaceous of the Mesozoic Era, from approximately 180 million to 135 million years ago, when primitive birds appeared and conifers were prominent. [1/2 definitions] |
| late |
towards the end of a historical era or period of time. [1/7 definitions] |
| Mesozoic |
of, relating to, or designating the geological era between the Paleozoic and the Cenozoic, from approximately 220 million to 65 million years ago, when dinosaurs appeared and became extinct and ferns were abundant. [2 definitions] |
| mid-Victorian |
a person living during the mid-Victorian era. [1/3 definitions] |
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