(1) University of California Berkeley scientists confirmed that a cluster of fossilized bones found in Silicon Valley are likely the remains of a mammoth. (2) The giant beast would have roamed the area between 10,000 and 40,000 years ago. (3) A pair of elephant-like tusks, a huge pelvic bone and the animal's rib cage were found by an amateur naturalist while walking a dog along a canal near San Jose's Guadalupe River, near recent flood control dredging. (4) It could be the remains of a Columbian mammoth, according to paleontologists who expect to study the site like an archeological "dig," with shovels, sieves and brushes.

Which of the following sentences would best begin the paragraph above?