The creature, named Mystacodon selenensis, is the oldest baleen-whale relative yet found. 2017).“This is the fossil that we’ve been waiting for,” says Nick Pyenson, a palaeontologist at the Smithsonian National Museum of Natural History in Washington DC.
The skeleton displays traits that place it firmly as the first baleen-whale relative known to emerge after an ancient group of whale ancestors called basilosaurids split into two: one branch led to the toothed whales, which include sperm whales (Physeter macrocephalus) and dolphins, and the other to baleen whales. Whale fossils from this time period can answer a lot of questions that researchers have about the origins of living whale lineages, he says.
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.
Chronological dating, or simply dating, is the process of attributing to an object or event a date in the past, allowing such object or event to be located in a previously established chronology.
Superposition in archaeology requires a degree of interpretation to correctly identify chronological sequences and in this sense superposition in archaeology is more dynamic and multi-dimensional.
Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.
Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.
These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.
For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.
Yet even here there is to be seen a relative diminution of the higher pay.
This proprietor was a man of great opulence, and a relative of Naomi. Do you know, sir, that I am the friend and relative of that sick gentleman?
I might be said to be without a friend, or relative, in the world. He was another friend, and even a relative, of the "illustrious master." Have you heard him speak of late of any relative of mine or his, called Pecksniff?
To her, the relative importance of the farm to Billy was as simple as a problem in addition.