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The assumed thickness of the annual layers is important because it constrains the annual thickness in the measurements.The measurements can deviate a little from the assumed annual layer thickness but not by much.The new deep Dome C ice core from the top of the Antarctic ice sheet is claimed to have drilled seven ice age cycles for a total of about 700,000 years near the bottom. Except for coastal ice cores that show only one ice age cycle, the Antarctica ice sheet is dated by that the astronomical theory of the ice age is correct.9 In fact, this assumption also undergirds the annual layer dating of the Greenland ice sheet.10 This is how they obtain three or more ice age cycles, with each cycle being 100,000 years long.They simply count the assumed number of ice age cycles and multiple by 100,000 years, the assumed period for the astronomical theory.The upshot of their assumptions is that the On the other hand, if the ice built up rapidly, as in the creationist model during the Ice Age, the annual layers would be very thick at the bottom and thin upward to the present average annual layer thickness.There would be some compression of ice during this short time, of course, but far less than the uniformitarian model suggests.2 Figure 12.4 shows these contrasting views of the annual layer thickness with depth.These dates are not objective; they simply are based on the assumption of the astronomical theory and old age, which was discussed in chapter 6.It is easy to reinterpret the data from the ice sheet within the creationist’s framework, as we will see in the next section.
We certainly must entertain the possibility of misidentifying the deposit of a large storm or a snow dune as an entire year or missing a weak indication of a summer and thus picking a 2-year interval as 1 year.
For instance, in the oxygen isotope method, uniformitarian scientists normally need eight measurements per annual cycle to pick up the “annual” signature.
As an example, halfway down the GRIP Greenland ice core at about one mile (1,600 m) deep, uniformitarian scientists believe the annual layer thickness is 4 inches (10 cm).3 The measurements for oxygen isotopes would then be spaced every 1/2 inch (1 cm) apart.
The claimed 110,000 annual layers in the GISP2 ice core to near the bottom of the Greenland ice sheet is not a straightforward deduction.
The annual layers, indeed, show up well near the top of the ice sheet.