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When used in paleontology, suture can also refer to fossil exoskeletons, as in the suture line, a division on a trilobite between the free cheek and the fixed cheek; this suture line allowed the trilobite to perform ecdysis (the shedding of its skin).
The two types of fossils can be distinguished by many features, most obvious among which is the suture line: simple in Orthoceras (see image), intricately foliated in Baculites and related forms. See also
Baculites showing sutures and remnant aragonite; western South Dakota, Late Cretaceous. Baculites from the Late Cretaceous of Wyoming. The original aragonite of the outer conch and inner septa has dissolved away, leaving this articulated internal mold. Cenomanian: Baculites gracilis is known from the Cenomanian Britton Formation. Turonian:
The suture line has four main regions. Placenticeras sp. showing sutures. The external or ventral region refers to sutures along the lower (outer) edge of the shell, where the left and right suture lines meet. The external (or ventral) saddle, when present, lies directly on the lower midline of the shell.
Sutures (or suture lines) appear where each septum contacts the wall of the outer shell. In life, they are visible as a series of narrow wavy lines on the outer surface of the shell. Like their underlying septa, the sutures of the nautiloids are simple in shape, being either straight or slightly curved.
The suture forms a finely squiggly line with well-defined lobes and saddles. Brancoceras (Eubrancoceras) aegoceratoides reached a diameter of at least 4.2 centimetres (1.7 in). Brancoceras is representative of the subfamily Brancoceratinae, which makes up part of the acanthoceratacean family Brancoceratidae. Its stratigraphic range is rather ...
Sutures in the Phylloceratidae vary in complexity and are usually described on the basis of the saddles, which diverge to the front. Saddle endings may be double (diphyllic), triple (triphyllic), or quadruple (tetraphillic). [1] Branching may be asymmetric.
The red line shows where the Iapetus Suture extends through present-day Ireland and Great Britain. A related suture through Denmark, Poland and Ukraine is the Trans-European Suture Zone. The Iapetus Suture is one of several major geological faults caused by the collision of several ancient land masses forming a suture.
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