A forum is only as active as its threads.
If others are going to reply to your topic it will happen no matter what forum it is in.
I guess it comes down to what direction you want this topic to head. If you are planning on staying out of science and geology and work strictly on a biblical basis, maybe the other thread would be more appropriate.
If, on the other hand, you are planning on letting others with a geology background explain how many see this anomoly as a geological formation or on the science behind what is seen then this is a better fit.