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Although growth rates can vary considerably due to a number of factors, nodules have consistently been observed growing at rates hundreds of thousands of times faster than the slow rates calculated from radioisotope dating methods.rapid in order to prevent the formation of nodules at these faster growth rates.These surfaces are especially important since they are observed on a global scale.The deepest global planation surface is called the Great Unconformity.Because these sediment layers can be many hundreds of meters thick, and because it’s assumed that sedimentation rates have always been slow, secular scientists believe the sediment deposition required many millions of years.Secular scientists assign ages to these layers by using the astronomical or Milankovitch hypothesis of ice ages to interpret chemical clues within the seafloor sediments.Secular scientists believe these planation surfaces define the tops and bottoms of what are termed .
These megasequence-bounding erosional surfaces, like the Great Unconformity, have been traced across the globe and yet the mechanism of their formation continues to perplex secular scientists. So if no modern geologic process can account for the creation of flat planation surfaces, then how did they form?
These chemicals originate in seawater or within water trapped between the sediment grains below the sea floor.
In both cases, the end result is the formation of metallic pellets near the surface of the ocean floor.
Manganese Nodules Manganese nodules are typically potato-size concretions found scattered on the ocean floor (Figure 1).
Composed of manganese and other metals such as iron, nickel, and copper, these nodules form as a result of the accumulation of chemicals onto a nucleus.
Moreover, this glaring discrepancy between the calculated and observed rates of nodule growth is just one more indication that there are Planation Surfaces If most of the seafloor sediments were rapidly dumped into the ocean basins, then one might expect additional geological clues to fit this interpretation of the data. Across every continent, we observe flat or nearly flat erosional surfaces that extend for many miles.