The first 3 eons are part of a time interval known as Precambrian time 4 billion-year interval with very few fossils. From Wordnik.com. [Recently Uploaded Slideshows] Reference
The Proterozoic, Archean and Hadean are often collectively referred to as Precambrian Time, and sometimes also as the Cryptozoic. From Wordnik.com. [Table of geologic time - The Panda's Thumb] Reference
(551-2500 million yrs BP) Also known as Precambrian Eukaryotic cell organisms develop. From Wordnik.com. [Geologic time] Reference
Paleobotany: Sedimentary rocks show pollen in very deep, "Precambrian" strata. From Wordnik.com. [CreationWiki - Recent changes [en]] Reference
The term 'Precambrian' is widely used for the geologists and paleontologists, but that term is not official name. From Wordnik.com. [CreationWiki - Recent changes [en]] Reference
Bedrock at Iona Island is mostly Precambrian gneiss. From Wordnik.com. [Hudson River National Estuarine Research Reserve, New York] Reference
Precambrian and Paleozoic rock underlies Ecoregion 66d. From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
Shale, chert, and Precambrian igneous rocks are also present. From Wordnik.com. [Ecoregions of Iowa and Missouri (EPA)] Reference
Most of the ecoregion is located on the Siberian Precambrian platform. From Wordnik.com. [East Siberian taiga] Reference
Precambrian fossils have been found at Mistaken Point Ecological Reserve. From Wordnik.com. [South Avalon-Burin oceanic barrens] Reference
Precambrian and Paleozoic metavolcanic and igneous rock underlie Ecoregion 66a. From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
Geologically, these are recently deposited sands over Precambrian basement rocks. From Wordnik.com. [Hobyo grasslands and shrublands] Reference
These occur primarily on Precambrian-age igneous and high-grade metamorphic rocks. From Wordnik.com. [Ecoregions of Alabama and Georgia (EPA)] Reference
Substrate here consists largely of hard, slow-weathering Precambrian quartzose rocks. From Wordnik.com. [Tasmanian temperate rain forests] Reference
Geologically, the majority of the ecoregion is found on the Precambrian African shield. From Wordnik.com. [Cross-Sanaga-Bioko coastal forests] Reference
Precambrian granite is exposed on the west face of the Sandia Mountains near Albuquerque. From Wordnik.com. [Ecoregions of New Mexico (EPA)] Reference
Precambrian volcanic, granitic, serpentine, and sandstone rocks form the underlying geology. From Wordnik.com. [Central Zambezian Miombo woodlands] Reference
The parent rock in this region is mostly Precambrian basement material of the African Shield. From Wordnik.com. [Eastern Guinean forests] Reference
The early Precambrian strata, known as the Vishnu Metamorphic Complex, are devoid of fossils. From Wordnik.com. [Grand Canyon National Park, United States] Reference
Inceptisols, Ultisols, and Alfisols have developed on the Cambrian, Paleozoic, and Precambrian rock. From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
The sedimentary layers of these mountains have been eroded away to expose the Precambrian igneous core. From Wordnik.com. [Ecoregions of Wyoming (EPA)] Reference
The majority of the area overlies Precambrian bedrock, with pre-Cretaceous sediments in the northern sector. From Wordnik.com. [Northwestern Congolian lowland forests] Reference
The ancient Precambrian rocks form the substrate of the montane forests in southwestern Ethiopia and Eritrea. From Wordnik.com. [Ethiopian montane grasslands and woodlands] Reference
These range from Precambrian basement, through Tertiary volcanic lavas, to Quaternary basin and dune formations. From Wordnik.com. [Northern Acacia-Commiphora bushlands and thickets] Reference
Rocks found in the shields were formed during the Precambrian and are some of the oldest rocks found on the Earth. From Wordnik.com. [Formation of the Earth's crust] Reference
In addition, 50k has more shallow bedrock than surrounding regions, with areas of exposed Precambrian basalt and granite. From Wordnik.com. [Ecoregions of Wisconsin (EPA)] Reference
Continental crust contains some very old rocks that were formed during the Precambrian between 3 and 4 billion years ago. From Wordnik.com. [Formation of the Earth's crust] Reference
The southern extent is delineated by the limits of these Precambrian rock outcroppings, with younger rocks on either side. From Wordnik.com. [Atlantic Equatorial coastal forests] Reference
Elsewhere, Precambrian granitic gneiss, Precambrian hornblende gneiss, and fanglomerate are common (Berg and others, 1980). From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
Precambrian units are widespread and consist of quartzite, schist, phyllite, conglomerate, dolomite, siltstone and sandstone. From Wordnik.com. [Tasmanian Wilderness, Australia] Reference
Scattered outcrops of very basic serpentinite also occur. formations predominate and Precambrian gneisses are common in the east. From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
The geology of the ecoregion is characterized by Precambrian metamorphic rocks such as schists, amphibolites, quartzites, and gneiss. From Wordnik.com. [Atlantic Equatorial coastal forests] Reference
In my vacation from TV, I've gone from being nerdy because I watched anime to being nerdy because I've only watched Precambrian anime. From Wordnik.com. [Tune In, Turn On, Veg Out] Reference
Geologically the area consists of a Precambrian basement capped in most places by thick Tertiary basaltic lava flows (the Trap Series). From Wordnik.com. [Ethiopian montane grasslands and woodlands] Reference
Ecoregion 66c is underlain by Precambrian metamorphic rock, including quartzite, graywacke, and conglomerate of the Lynchburg Formation. From Wordnik.com. [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference
In many areas late Precambrian outcrops of granitic gneisses and quartzite project from the surface as inselbergs (locally called kopjes). From Wordnik.com. [Southern Acacia-Commiphora bushlands and thickets] Reference
Another, albeit minor, feature of cape landscapes are scattered outcrops of Precambrian granite, especially along the West Coast forelands. From Wordnik.com. [Montane fynbos and renosterveld] Reference
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