trilobite

How To Use trilobite In A Sentence

• There are petroglyph sites, archeological and paleontological sites and, still in Utah, a quarry where you can go and dig for your own trilobite. Archive 2009-09-01
• Hundreds of fossils are locked in glass cases, specimens from all over southern Africa: shells and worms and nautiluses and seed ferns and trilobites, and minerals, too; yellow-green crystals and gleaming clusters of quartz; mosquitoes in drops of amber; scheelite, wulfenite. Memory Wall
• The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).
• Some trilobites lost their eyes, probably those that burrowed in mud or lived in lightless parts of the ocean.
• Ordovician strata are characterized by numerous and diverse trilobites and conodonts (phosphatic fossils with a tooth-like appearance) found in sequences of shale, limestone, dolostone, and sandstone.
• This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon.
• Darwin predicted that precursors to the trilobite would be found in pre-Silurian rocks … Similarly, Darwin predicted that Precambrian fossils would be found. Blast From the Past
• In fact, it is possible that the group is paraphyletic; the last common ancestor of all polymerid trilobites may also have been ancestral to the agnostids as well.
• Clearly visible within the imprint were the remains of trilobites, extinct marine arthropods.
• The trilobite eye is in continuity with the rest of its shelly armor.