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Old 03-23-2012, 02:26 PM
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BIG RED 1983 BIG RED 1983 is offline
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[SIZE=-1]The fossils of Basilosaurus cetoides (Owen) and Zygorhiza kochii (Riechenbach) were the first of many fossil finds that show that modern whales, e.g. the humpback whales evolved from dog-like creatures known as Mesonychids. Both Basilosaurus and Zygorhiza, exhibit unmistakable characteristics of the terrestrial Mesonychids from which they developed. For example, their skulls retained many of the features of the mesonychids despite a pronounced elongation. Also, the primitive whales such as Basilosaurus pocessed the distinctive, teeth set of the Mesonychids with well-defined incisors, canines, premolars, and multirooted molar. In addition, these whales, e.g. Basilosaurus, had well-defined vestigial rear legs (Gingerich et al. 1990, 1993, Thewissen 1994).[/SIZE][SIZE=-1]Later, these primitive whales gave rise to toothless and toothed whales. In case of the toothed whales, the teeth evolved into the teeth of the toothed whales, e.g.. the dolphins, killer whales, and sperm whales. The Baleen (toothless) whales, the other branch of whales, developed modified mouth structures that strained plankton from the sea water enabling them to graze the oceans. It should be noted that although it belongs to the group of primitive whales ancestral to modern whales, Basilosaurus is likely a relative of the direct ancestors of modern whales. Rather, it appears that Zygorhiza was closer to the direct line of descent of modern whales than Basilosaurus (Gingerich et al. 1990, 1993, Thewissen 1994).[/SIZE]
[SIZE=-1]For a long time, Basilosaurus was among the earliest known whales being found in rocks as old as Middle Eocene. Since its discovery in 1834, no older primitive whales transitional to ancestral land-mammals had been discovered from earlier rocks leaving an obvious gap in the fossil record. However, research in Pakistan and elsewhere have found the critical fossils to fill a substantial portion of this gap.[/SIZE]
[SIZE=-1]Among the ancestors or close relatives to the ancestors of Basilosaurus and modern whales are:[/SIZE]
[SIZE=-1]1. Rodhocetus kasrani - Eocene (Gingerich et al. 1994)[/SIZE]
[SIZE=-1]2. Pakicetus - latest Early Eocene (Gingerich et al. 1983, Thewissen et al. 1993)[/SIZE]
[SIZE=-1]3. Ambulocetus natans - Early to Middle Eocene (Thewissen 1994)[/SIZE]
[SIZE=-1]4. Indocetus ramani - earliest Middle Eocene (Gingerich et al. 1993)[/SIZE]
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Old 03-23-2012, 02:33 PM
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Big Red for the win!!!!!

That is a whale bone I found in a creek in the middle of Caldwell Parish. Not exactly sure, but it looks like the femur bone (whales obviously don't have legs, but its a vestigal feature left behind). The other bone is a whale rib bone.

That area was under the sea millions of years ago and you can walk in woods and the small prairies and find small shells. I have found many shark teeth in the creeks and parts of coral, lots of oyster shells and marine life up there. I found some really large molars I am trying to figure out what animal they came from and when I do we can play again.
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