Limestone Layers and the Flood

Doesn't Brown's scenario just shift the problem around ? All he's doing is moving calcium carbonate out of the hypothetical caverns, without explaining where it came form in the first place.And surely he isn't going to get more CO2 out of the caverns than was there already unless some of the Calcium combines with other chemicals, instead of precipitating out as carbonate. So how does "some CO2" in the caverns turn into "considerable CO2' in the atmosphere ?e

We're not looking at utimate origins here, just how limestone formed. If Brown has to rely on assuming that God put a lot of limestone in these hypothetical caverns for some reason we don't know then he hasn't got a good explanation for the presence of limestone.The problem with the CO2 is that Brown describes it as a small quantity in the context of the caverns and then makes it sound as if it were a far larger quantity when it is released into the atmosphere. But he gives no mechanism for producing more. You can't just take "extra" CO2 out of the solution without dealing with the calcium ions.g

If Brown can't explain why limestone exists then he hasn't solved the major problem. And his explanation of how it got to where it is is at present just vague speculation which seesm to be contrary to the evidence that much of the limestone found is biogenic.On the other point, "cavenrs" seems a fair description sicne we are talking about subterranean cavities. And "some" does not imply a vey large quantity. But so far as I can see it would have to be a large quantity in the context of the caverns to be significant in terms of the atmosphere. Certainly this claim is in need of further explanation..