Evolutionist J.R Norman, Associate Curator, in the Department of Zoology, British Museum of Natural History, London, has said, "The geological record has so far provided no evidence as to the origin of the fishes.”
I'm guessing you never actually read the paper. He published it 52 years ago.
Which means we really do not know how they came about
One of the dangers of basing your belief in God on what we don't know, is that tends to change. A lot of things have been learned in the past half-century.
Because they appear in the geo column all at once and fully formed.
But Nelson never wrote that. Would you like to learn why? Let's go take a look...
The first thing that could be called a "fish" was a cephalochordate. Pikaia gracilens dates from the the Mid-Cambrian, and is the first known chordate (the phylum including fish and us among others). Some of them still live; this is the body plan of Amphioxus, a cephalochordate.
Notice no gills, no fins, no eyes, no brain, etc. Hardly "fully formed."
Let's move on.
A bit later in the Cambrian, we have Haikouichthys.
A little more fishlike, but still not fully formed. No jaws, no opercula, no pectoral fins, no anal fins. But now there's a cranium. Animals like this still live, the hagfishes, and the lampreys. But we're getting closer to "fully formed."
Here's one a bit later, with primitive jaws, and complex bones forming a face:
At first blush, Entelognathus appears to be an ordinary placoderm, an extinct type of heavily armored fish. All placoderms discovered before now have sported simple jaws and cheeks, with only a few large bones making up their outer surfaces.
"But the original fossil of Entelognathus proved to be something far more bizarre and significant," Zhu told LiveScience.
On closer inspection, the fish possesses a complex arrangement of smaller bones known as a premaxilla and maxilla on its upper jaw, a dentary, or mandible, on its lower jaw, as well as cheekbones. These complex facial bones are characteristic of bony fish and land animals, including humans, making this bizarre-looking fish the most ancient animal with what humans would recognize as a face, Zhu said.
http://www.livescience.com/39937-fossil-fish-oldest-creature-with-face.html
And so on. How far to "fully formed" would you like to go? Or shall we get back to the original point about how fish gave rise to tetrapods/
Secondly as to the theory that they evolved into amphibians we have an additional problem. The fact is that in many cases they appear in these same early layers along with the fish and in some places in layers preceding fish.
You've been misled about that. There are no land animals at all from the time the fish discussed above, were alive.
If there was an evolutionary progression demonstrated the fish would precede the amphibians by 100s of thousands or millions of years in the layers
See above. There you are.
(and now another quote-mining attempt)
So it is apparent that "Since the fossil material provides no evidence of other aspects of the transformation from fish to tetrapod, paleontologists have had to speculate how legs and aerial breathing evolved..." (Barbara J. Stahl, "Vertebrate History: Problems in Evolution", McGraw-Hill, NY 1974 pg. 148&195)
Better, this one is only forty-one years out of date. However, as you learned, progress goes on. Tiktaalik, Acanthostega, and many others have shown up since then. This is one of the real dangers for creationists inclined to quote-mine.
YES!!! See how easy it is to be objective with the actual data?
It would have been safer for you to go with the data, instead of quote-mining.
Stahl is an internationally renowned Ph.D. in Paleoichthyology. But rather than trying to make it fit (and sometimes that is deceptive) she just tells it like it is.
And now you know better. Think about it, and consider using data instead of old quotes.