Free Fossil Hunter by Robert J. Sawyer Page B

though, he’d found nothing like that. In fact, this layer was remarkably similar to all the layers above it: rich with sea-shells, with bones of fish, and even with occasional pieces of the skeletons of great water serpents, similar to the famed Kal-ta-goot that Afsan had killed aboard the sailing ship Dasheter .
    A great fissure ran through the rocks here, the handiwork of a landquake, no doubt. At this little perch, one could reach into the side of the cliff and simply pull out chunks of rock. The material here, just below the Bookmark layer, was a gray shale. It split cleanly along bedding planes, and Toroca opened slab after slab of it. Every piece was pristine, not marred by the fossils that were shot through the rocks from higher up.
    Toroca whacked the flat end of his hammer against the chisel again, and another slab split cleanly open. Nothing. He tried again with a different piece, a surprisingly heavy piece, but accidentally smashed his thumb instead. Occupational hazard: he didn’t even really feel the pain anymore. He repositioned the chisel and tried once more. This slab, for a change, did not split cleanly. The upper layers started to separate, but ceased to split off about halfway across. Curious. Toroca used his fingers to pry the slab apart. A large hunk snapped off, exposing a small rounded bit of something strange.
    Something blue.
    There were blue gemstones, of course, and a couple of blue minerals, but they were not normally found in downrocks such as these. But this thing, whatever it was, was definitely blue, a light shade, like that of certain wingfinger eggshells.
    There was only a tiny piece of it visible, jutting from the bedding plane. Toroca turned the slab over and positioned his chisel on the opposite side, then tapped his hammer lightly against it. The stone began to split, and once again he pried with his fingers to separate the rock. It took a great effort, but at last the upper layers broke free in sharp-edged flat pieces. He let them slide away, tumbling down the cliff face. There, just about in the middle of the slab, was a blue hemisphere with a diameter the length of Toroca’s longest finger.
    Toroca was normally excited by every discovery, for each new one advanced his knowledge. But with this one, he simply felt puzzled and confused. After all, he had thought these rocks were old, coming from just below the first layer in which remnants of life were found. But this was clearly a manufactured object, meaning that it couldn’t be very old at all: perhaps a few hundred kilodays, although its smooth surface made even that much of a pedigree doubtful.
    And then it hit him, causing his heart to flutter. The theory of superposition, carefully worked out by the late Irb-Falpom, might be destroyed by this find. Falpom’s theory had seemed so elegant, so simple: the older rocks were on the bottom. Such a revolution that had made in geology! But Toroca’s survey was the first one extensive enough to really prove or disprove the theory, although it had been accepted as fact for several kilodays now. Everything found to date had seemed to coincide with superposition, but now this, whatever it was, destroyed all that. A theory was only as good as the data that supported it, and superposition couldn’t explain a contemporary artifact buried deep within ancient rock.
    For one brief moment, Toroca thought about tossing aside the find, never showing it to anyone. The theory was so good, after all, and it was the one great claim to fame of his mentor and friend, Falpom. But of course he couldn’t do that. He was a scholar, and this blue dome was a fact, a fact that had to be accounted for.
    It was surprising that the object, whatever it was, had survived burial so well. Regardless of what theory would eventually replace superposition, this blue thingamajig had been here for some time, in these rock layers, with the weight of all the cliff above pressing down on it. That it wasn’t crushed, or