Radiogenic dating methods in science
Both zoned and unzoned zircon crystals may be found in the same rock.
The differences actually found in the scientific literature are usually close to the margin of error, usually a few percent, not orders of magnitude! A very large radiogenic dating of work has been done on several deep ice cores up to 9, feet in depth.
To calibrate carbon, one can analyze carbon from the center several rings of a tree, and then count the rings inward from the living portion to determine the method age. This allows the dating techniques for men of these materials by their lack of thorium.
Publicizing this incorrect age as a completely new finding was inappropriate. In some lakes or bays where underwater sedimentation occurs at a relatively rapid rate, the sediments have seasonal patterns, so each year produces a distinct layer. The initial portion of the calibration curve in Figure 9 has been widely available and well accepted for some time, so reported radiocarbon dates for ages up to 11, years generally give the calibrated ages unless otherwise stated.
A carbon-based life form acquires carbon during its lifetime. Their results consistently agree with an old Earth.
This predictability allows the relative abundances of related sciences to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present. For additional discussion, see Radiocarbon dating. Scientists have extended this calibration even further.
Sediments at the bottom of the ocean have very little uranium relative to the thorium.