Skeletal Grain types

Other Pelagic Biota

1. Radiolaria and bivalves

Skeletal packstone containing thin-shelled bivalves and rounded tests of radiolaria (zooplankton with siliceous test) characterizing middle Jurassic basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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2. Radiolaria

Skeletal wackestone with radiolaria typical of middle and upper Jurassic basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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3. Radiolaria

Skeletal wackestone with radiolaria typical of middle and upper Jurassic basinal facies. Image in crossed polarisers showing siliceous composition of the test.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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4. Radiolaria and Saccocoma

Skeletal wackestone to packstone with rounded tests of radiolarian, siliceous sponge spicules and Saccocoma (a crinoid with pelagic life mode) typical of upper Jurassic (Kimmeridgian-Tithonian) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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5. Radiolaria and Saccocoma

Skeletal wackestone to packstone with radiolarian, siliceous sponge spicules and Saccocoma (a crinoid with pelagic life mode) typical of upper Jurassic (Kimmeridgian-Tithonian) basinal facies. Image in crossed polarisers showing siliceous composition of the radiolaria tests.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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6. Stomiosphaera

Skeletal wackestone containing Stomiosphaera moluccana indicative of Tithonian (upper Jurassic) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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7. Radiolaria and calpionellids

Skeletal wackestone containing radiolaria and calpionellids (Crassicollaria sp.) indicative of upper Tithonian (upper Jurassic) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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8. Radiolaria and calpionellids

Skeletal wackestone containing radiolaria and calpionellids: in the centre Crassicollaria intermedia indicative of upper Tithonian (upper Jurassic) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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9. Calpionellids

Skeletal wackestone containing Calpionella alpina indicative of uppermost Tithonian-Berriasian (upper Jurassic-lower Cretaceous) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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10. Calpionellids

Skeletal wackestone containing abundant fragments of calpionellids among which Calpionella alpina indicative of uppermost Tithonian-Berriasian (upper Jurassic-lower Cretaceous) basinal facies.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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bivalve

radiolaria

radiolaria

radiolaria

Saccocoma

Saccocoma

Stomiosphaera moluccana

radiolaria

Crassicollaria

Crassicollaria

radiolaria

Calpionella alpina

Other Pelagic Biota

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bivalve

radiolaria

radiolaria

radiolaria

Saccocoma

Saccocoma

Stomiosphaera moluccana

radiolaria

Crassicollaria

Crassicollaria

radiolaria

Calpionella alpina