The pic below is a goniatite. These creatures present a tremendous problem to the young-earth paradigm.

http://www.crystal-world.com/photos/...ammonite54.jpg

Consider the situation with the Namurian of England:

“Oscillations of the sea level were frequent in the Namurian and according to Ramsbottom some 60 marine bands, each with a diagnostic goniatite fauna, are recognisable in the British Namurian. A new goniatite fauna inhabited the area every 200,000 years. Ramsbottom calculates that the mudstones were deposited at about 1 ft in 4000 years. Within the fossil bands, benthonic faunas (brachiopods, crinoids, etc.) occur around the margins of the Central Province whilst goniatite-pectinoid faunas occupy the main central areas, which may have had relatively deep water.” T. R. Owen, The Geological Evolution of the British Isles, (New York: Pergamon Press, 1976), p. 80

and

“Second, the biostratigraphic framework with discrete, often basin-wide bands of goniatites and their correlatives dissecting the basin fill at numerous levels provides an excellent basis for correlation. Around 60 such bands were deposited during the 11 Ma-long Namurian epoch in northern England, yielding an average age of around 180,000 years for each intervening interval.” O. J. Martinsen, “Namurian (late Carboniferous) depositional Systems of the Craven-Askrigg area, Northern England: Implications for Sequence-Stratigraphic Models,” in Henry W. Posamentier, Colin P. Summerhayes, Bilal U. Haq and George Allen, editors, Sequence Stratigraphy and Facies Associations, Spec. Public 18 International Association of Sedimentologists, (Oxford Blackwell Scientific , 1993, pp 247-281, p. 248-249

If we look at this as the remains of a one year global flood, then we can
calculate how long each of the 60 cycles took. There are 10,000 feet of strata (approximately) beneath this site. The Namurian is 4000 feet thick. Assuming that the Namurian alone took one year, then we have 365/60 = 6 days per goniatite fauna. If one adds the sediment below to the calculation then one finds that the 4000 feet took 146 days to be deposited resulting in 2.4 days per goniatite fauna. And just to the east of England, lying above the Namurian strata is 30,000 feet of younger sediment in the North Sea. If we add all this up and say that all of it must have been deposited in the one year flood, then we find that each goniatite fauna took 14.6 hours.

What would cause the appearance of entirely new goniatites every 14.6 hours? That makes no sense. Why wouldn't one goniatite appear out of order (and they don't). The one year global flood won't answer this problem.

But let's turn to David Tyler's post-flood recolonization model. He believes that 2000 years is the post flood deposition and that he believes that the post-Ordovician sediments were deposited during that time, We can use two methods of calculating this. The sedimentary method says that there are about 38,000 feet of post-Ordovician sediment which must be deposited above the Namurian. This means that 19 feet of sediment are deposited every year. The Namurian would take 210 years to be deposited resulting in a new Namurian goniatite fauna every 3.5 years. Alternatively, we can linearly scale the 11 million years here. The Ordovician was 443 million years ago. 11/443 = .0248 or 1/25 of the time. 2000 *1/25 = 50 years. Thus, since there are 60 goniatite bands, it means that a new goniatite band arose every 50/60= .833 years or 10 months. So how do we do this? What causes a new species to appear every 10 months to 3.5 years?

These goniatites appear out of nowhere and disappear into nothingness. What kind of recolonization model allows forms to appear and disappear with great rapidity? This whole concept of a young-earth is silly.