Experts say it seems to defy all known groups of organisms and descriptions, pictures of it, leave people with more questions than answers.

There is no doubt we are dealing with a biological creature, scientists say. When it lived it was gigantic and it stood upright.

Around 450 million years ago, shallow seas covered the Cincinnati region and harbored one very large and now very mysterious organism.

Despite its size, no one has ever found a fossil of this "monster" until its discovery by Ron Fine of Dayton, an amateur paleontologist last year.

For more than 200 years, the rocks of the Cincinnati region have been among the most studied in all of paleontology, and the discovery of an unknown, and large, fossil has professional paleontologists scratching their heads.

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