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burrows

Deion: Trace fossils (burrows) in the Bright Angle Shale of Grand Canyon National Park.

نویسنده: کوروش بهارمست(دوشنبه 86/11/1 ساعت 2:57 عصر)

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cambrian age trace fossil

Deion: Trace fossils in the Tapeat Sandstone (Cambrain age), Grand Canyon, Arizona.

نویسنده: کوروش بهارمست(دوشنبه 86/11/1 ساعت 2:53 عصر)

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Worm burrow jungle"

Worm burrow jungle"

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 9:5 عصر)

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"SHRIMP BURROW JUNGLE"

"SHRIMP BURROW JUNGLE"

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 9:4 عصر)

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about trace fossils

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:55 عصر)

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trace fossild

Trace fossils on bedding plane of the varvite.

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:45 عصر)

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thalasinoides

Palaeophycus/?Thalassinoides, flattened cylindrical burrows, usually 5-25 mm in diameter. Straight or curved, surface rather featureless. Y shaped branching sometimes observed. Can often form a complex interlacing mass. They may be interpreted as dwelling or crawling traces of crustaceans.

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:39 عصر)

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a rare trace fossil


This is a rather rare trace fossil called Helicodromites mobilis. It is a horizontal helical spiral. As can be seen when sectioned, the spiral produced off-set circular sections are clearly visible in this example. That section is not central so three of the spiral sections are cut longitudinally. H. mobilis occurs in deep-water muds, but also in shallower settings as long as the seafloor is quiet and muddy.

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:38 عصر)

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rhyzocoralium


Rhyzocoralium, a U shaped trace fossil

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:34 عصر)

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condrites


Palaeophycus and Chondrites. Paleophyeus are flattened burrows from 5mm to 25mm in diameter. They are unbranched, straight or curved. Chondrites are 0.3to 0.6.. diameter, repeatedly dichotomously branching burrows. Abundant, often filling spaces between larger burrows. Has been interpreted as feeding burrow of a sipunculoid worm

نویسنده: کوروش بهارمست(یکشنبه 86/10/30 ساعت 8:28 عصر)

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