The section is very fossiliferous, with an abundant brachiopod, bryozoan, coral, and phacopsid trilobite assemblage. |
|
Blind, totally eyeless trilobites have given us another indication of the range of trilobite habits and habitats. |
|
This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon. |
|
Sundberg interpreted many aspects of trilobite evolution in terms of homeotic change. |
|
We know the first animal to have an eye was a trilobite that was a predator as well. |
|
Furthermore, trilobite faunas in the Early Cambrian were already differentiated biogeographically. |
|
Leperditiid shells are the dominant bioclasts and trilobite fragments are rare. |
|
Leiocoryphe gemma may be a paedomorphic species derived from some Upper Cambrian trilobite with an effaced cephalon. |
|
Bryozoan and trilobite fragments, brachiopod spines, turrilepadid plates, and multiplacophoran spines are silicified. |
|
The GSSP marks the first appearance of the trilobite Glyptagnostus reticulatus in the fossil record. |
|
One of the trilobite fossils found by Logan near Perce was illustrated in perfect detail in his field notebook. |
|
Franco Rasetti's drawing of the Middle Cambrian trilobite Albertella from the southern Rocky Mountains. |
|
Siltstone slab with moults of the trilobite Ogygopsis klotzi from the Trilobite Beds on Mount Stephen. |
|
A comprehensive trilobite zonation in Sweden has frequently been cited as a standard for correlation. |
|
Pseudogygites is much rarer in the underlying limestones where the most common asaphid trilobite is Isotelus. |
|
In this paper we report the discovery of a nearly complete trilobite fossil over 680 mm long that yields a reconstructed exoskeletal length of more than 720 mm. |
|
Pile of cigarette boxes containing Rasetti's trilobite specimens from Levis. |
|
The trilobite eye is in continuity with the rest of its shelly armor. |
|
Later, similarity of the Ontario species to the European trilobite Ogygites was noted by a few paleontologists, and it was renamed Ogygites latimarginatus. |
|
The trilobite body was segmented and divided into three regions from head to tail: the cephalon, or head region, separated from the thorax, which was followed in turn by the pygidium, or tail region. |
|
|
But trilobite spines seem too eccentric for any of these. |
|
For the animal to grow, the exoskeleton had to be shed, and shed trilobite exoskeletons, or portions of them, are fossils that are relatively common. |
|
Each trilobite body segment bore a pair of jointed appendages. |
|
The replica of a trilobite gives a better reproduction than the original. |
|
In the late 1850s, he wrote a series of papers on a single species of trilobite from black shales in southern Ontario that he named Asaphus canadensis. |
|
The trilobite is well preserved and readily identifiable as Labiostria, a rather obscure Late Cambrian trilobite known only from a few localities in western North America. |
|
This trilobite could not have been picked up anywhere near the Fraser River or, indeed, from any locality in central British Columbia where the oldest rocks and fossils are Devonian in age. |
|
Fossil of a trilobite about 8 cm in width facing this way. |
|
Just when we were there, so they could find really large trilobite. |
|
Like any arthropod encased in a rigid exoskeleton, a trilobite must periodically moult, or exuviate, in order to grow. |
|
It correlates well with the occurrence of widespread graptolite, conodont, and trilobite species. |
|
Everyone knows the charming trilobite Isotelus is the official state fossil of the Buckeye State. |
|
Some trilobites such as Asaphus kowalewski evolved long eyestalks to assist in detecting predators whereas other trilobite eyes in contrast disappeared completely. |
|
The earliest trilobite fossils are about 530 million years old, but the class was already quite diverse and worldwide, suggesting they had been around for quite some time. |
|
Tossed by the waves, I felt like a trilobite on its way to fossilhood. |
|
Trilobite zones allow biostratigraphic correlation in the Cambrian. |
|