Cambrian period

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  • noun

Synonyms for Cambrian period

from 544 million to about 500 million years ago


References in periodicals archive ?
In a press release issued by Virginia Tech, she said the rare findings filled in important gaps in understanding about animal movement before the Cambrian period.
The isotope signatures in the rocks relate to the global production of oxygen, allowing the team to determine oxygen levels present in the shallow ocean and atmosphere during the Cambrian period.
The major body plans that arise in the Cambrian period exhibit considerable morphological isolation from one another (or "disparity") and then subsequent "stasis." Though all Cambrian and subsequent animals fall clearly within one of a limited number of basic body plans, each of these body plans exhibits clear morphological differences (and thus disparity) from the others.
The Cambrian Period ushered in the advent of shells and over time shells and exoskeletons can be fossilized, giving scientists clues into how organisms existed millions of years ago, he said.
Dozens of individual theories have been put forward over the past few decades for this rapid diversification of animal species in the early Cambrian Period of geological time.
The Cephalopod class, including squid, octopus and cuttlefish, a) is neurologically advanced, b) the same organ serves multiple functions, c) some mollusks contain pearls, purple dye and shells that humans value; and d) the Cephalopod class dates back to the Cambrian period 541 to 485 years ago.
This book is both a scientific report and a personal journal of Brasiers quest to solve a mystery that puzzled Darwin himself: Why did there appear to be an absence of animal fossils in rocks older than the Cambrian period? This says Brasier is the "Lost World that was later found to have spanned more than eighty percent of Earth history."
Similarly, at the beginning of the Cambrian period, the author notes the emergence of another familiar aspect of the human race: consumer society.
"It is one of the oldest ranges on the face of the Earth and the Cambrian period is one of the earliest periods recorded in geology.
Harry Blackmore Whittington, 85, was awarded the 17th International Prize for Biology for his work documenting the differentiation of multicellular animals in the Cambrian period over 500 million years ago and for other achievements.
Examples of index fossils include brachiopods (which appeared in the Cambrian period), trilobites (extremely common in Palaeozoic layers) and ammonites (around during the Triassic and Jurassic periods).
He points out several cases of independent evolutionary development that generate nearly identical results--for example, reproduction methods in myxobacteria and slime molds, the development of keratinous beaks in birds, and the emergence of complex animal phyla at the base of the Cambrian period. If evolutionary changes are contingent, the probability of these evolutionary experiments being run twice with the same results is exceedingly low.
In browsing through various texts, I found nothing that would convey a better idea of risk management in general than the statement by the author of an article in the October 1993 issue of National Geographic that the evolution of life forms in the Cambrian period (i.e., upward of 500 million years ago) 'was an ever escalating race, and new offenses followed new defenses.' As an expression of the drive at the time, it fits the definition.
In the Cambrian period of the Paleozoic era, some 500 million years ago, a burst of biological creativity took place that finds an echo in the development of many technologies.
Previous fossil finds painted the cambrian period to be much simpler in structure.