Judging from the fossils that I have seen at the Tucson Gem and Mineral show, ammonites once ruled the world. I have only seen one small section of the displays but ammonites are by far the most abundant group of fossils, numbering in the thousands. You can buy them individually, by the bag, and by the the pound. They range in size from less than an inch to four feet in diameter.
I was lucky to see the massive four foot diameter specimens. They had sold to an undisclosed buyer from Austin, Texas. He had paid $9,000 in cash for two of the giants, both of which had been cut in half. According to the guys getting ready to box and ship the ammonites, one was going to the buyer’s home and one to a museum.
My only disappointment was in how little information was listed with the fossils. A handful had the scientific name, age, and locality, but most had nothing but price. Still the show of ammonites is impressive.