[Note: "mya" means "millions of years ago"] Ways to begin your exploration: * Dates from the International Commission on Stratigraphy's International Stratigraphic Chart, 2009; colors adopted from the Commission for the Geological Map of the World, 5/26/2011. Collins created this page, 11/26/94; Robert Guralnick and Brian R.
being oxidized to limonite (hydrous iron oxides), and also in a few areas the sand content is higher.
All the fossil wood samples were from short broken lengths of what were probably branches of trees fossilised .
The woody internal structure was clearly evident, thus the samples were not the remains of roots that had grown into this weathered rock from trees on the present land surface.
Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates.
Geologists use a wide variety of methods to understand the Earth's structure and evolution, including field work, rock description, geophysical techniques, chemical analysis, physical experiments, and numerical modelling.
When sampled, the fossil wood readily splintered, diagnostic of it still being ‘woody’ in spite of its impregnation with iron minerals during fossilisation.
Wiens has a Ph D in Physics, with a minor in Geology.
It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.
) is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.
The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).
Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon.