J
JimO
Guest
Chris W:
The whole geologic time scale was developed based on sedimentary rocks from all over the world. It is true that due because no one location has been likely under water (where deposition primarily occurs) throughout all of geologic history, there is no one location where rocks representing the entire geologic time scale are present. In fact, at any given location, it is likely that each distinct layer of rock (formation) represents a very small slice of “time.” Rocks, and the fossils contained within, are “aged” relative to one another. The volume of data collected over the years pretty much confirms the geologic periods that define the geologic time scale. I have not seen any legitimate debate disputing the relative ages of fossils that define the time scale. The timeframes assigned to geologic periods are based on assumptions developed from examination of rock formations worldwide.
What have been re-evaluated in recent years are the old assumptions about deposition rates (how much sediment is deposited in a given time period). The eruption of Mount St. Helens created layers of new sediments in lakes and valleys that were tens of feet thick. Using a typical marine depositional model, that much sediment could take thousands of years to accumulate. The same “re-thinking” has been applied to erosion and erosional features. A relatively recent near-failure of a large dam (I don’t recall the name) gave us a clear example of how quickly large erosional features can form. In short, rains caused the reservoir to reach its capacity. In order to avoid catastrophic failure, large volumes of water were released through a diversion tunnel. The force of the water began eroding the walls of the tunnel. Eroded particles gave the erosional “force” of the water more power (like a sand blaster). In the end, the steel reinforced concrete and several tens of feet of rock were eroded away in a matter of minutes.
You mentioned the Grand Canyon. The old theories suggested that a giant river slowly eroded the Canyon over millions of years. However, recent data, including satellite imaging, show erosional features that suggest enormous glacial lakes may have formed during the various glacial periods and that, as the glaciers melted, failures of the natural dams holding back the lakes released incredible volumes of water that eroded the Canyon in a series of catastrophic events.
It is possible that current understandings of historical geology may change as new data are gathered. That’s the scientific process. However, as I have stated in my posts, I don’t reject the idea of an ancient earth, nor elements of evolutionary theory. Our Catholic Faith is compatible with science. My purpose is not to try to force fit current scientific data into a specific interpretation of Genesis. I see Evangelical and Fundamentalist scientists attempt this and, frankly, on the whole, they are normally viewed as pseudo-scientists and not taken seriously.
It is important for scientists who are Christians to work within the accepted scientific framework. John Paul II said (I’m paraphrasing) that it is good to pursue a further understanding of the evidence that supports evolution, but that science will never contradict the Truth. In my opinion, it is best to engage scientists who are atheists in reasonable scientific discussion, but not to accept the atheistic premise that is often put forth at the outset of a discussion, where the spiritual is denied and only physical evidence (and only that evidence accepted by the atheist) is fair game. Those discussions go nowhere.
The whole geologic time scale was developed based on sedimentary rocks from all over the world. It is true that due because no one location has been likely under water (where deposition primarily occurs) throughout all of geologic history, there is no one location where rocks representing the entire geologic time scale are present. In fact, at any given location, it is likely that each distinct layer of rock (formation) represents a very small slice of “time.” Rocks, and the fossils contained within, are “aged” relative to one another. The volume of data collected over the years pretty much confirms the geologic periods that define the geologic time scale. I have not seen any legitimate debate disputing the relative ages of fossils that define the time scale. The timeframes assigned to geologic periods are based on assumptions developed from examination of rock formations worldwide.
What have been re-evaluated in recent years are the old assumptions about deposition rates (how much sediment is deposited in a given time period). The eruption of Mount St. Helens created layers of new sediments in lakes and valleys that were tens of feet thick. Using a typical marine depositional model, that much sediment could take thousands of years to accumulate. The same “re-thinking” has been applied to erosion and erosional features. A relatively recent near-failure of a large dam (I don’t recall the name) gave us a clear example of how quickly large erosional features can form. In short, rains caused the reservoir to reach its capacity. In order to avoid catastrophic failure, large volumes of water were released through a diversion tunnel. The force of the water began eroding the walls of the tunnel. Eroded particles gave the erosional “force” of the water more power (like a sand blaster). In the end, the steel reinforced concrete and several tens of feet of rock were eroded away in a matter of minutes.
You mentioned the Grand Canyon. The old theories suggested that a giant river slowly eroded the Canyon over millions of years. However, recent data, including satellite imaging, show erosional features that suggest enormous glacial lakes may have formed during the various glacial periods and that, as the glaciers melted, failures of the natural dams holding back the lakes released incredible volumes of water that eroded the Canyon in a series of catastrophic events.
It is possible that current understandings of historical geology may change as new data are gathered. That’s the scientific process. However, as I have stated in my posts, I don’t reject the idea of an ancient earth, nor elements of evolutionary theory. Our Catholic Faith is compatible with science. My purpose is not to try to force fit current scientific data into a specific interpretation of Genesis. I see Evangelical and Fundamentalist scientists attempt this and, frankly, on the whole, they are normally viewed as pseudo-scientists and not taken seriously.
It is important for scientists who are Christians to work within the accepted scientific framework. John Paul II said (I’m paraphrasing) that it is good to pursue a further understanding of the evidence that supports evolution, but that science will never contradict the Truth. In my opinion, it is best to engage scientists who are atheists in reasonable scientific discussion, but not to accept the atheistic premise that is often put forth at the outset of a discussion, where the spiritual is denied and only physical evidence (and only that evidence accepted by the atheist) is fair game. Those discussions go nowhere.