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9 results for “Onychites”
Fig. 7 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 7. Fitting of inner and outer edges of hooks to logarithmic spiral segments (thick lines). A. PMO 223.380. B. PMO 223.381. C. PMO 223.382 D. PMO 223.379. E. PMO 223.383. F. PMO 210.229.
Fig. 5 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 5. Mega− (Me) and micro−onychites (retouched). From Statoil well 33/9−C27, depth 3187.7 m (Upper Jurassic). PMO 223.405.
Fig. 8 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 8. Whorl expansion coefficients (b) for inner and outer spirals. Onychites quenstedti as figured by Engeser (1987: pl. 2: 5).
Fig. 9 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 9. Functional morphology of a hook or claw in a logarithmic spiral shape, penetrating a surface. A, B. Thrusting action, pole proximal. The angle φ at the contact point and the direction of the force vector (arrow) are constant during penetration. C, D. Pulling action, pole distal.
Fig. 2 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 2. Simplified stratigraphy of the upper part of the Agardhfjellet Formation in the Sassenfjorden area, Spitsbergen, with positions of mega−onychites. The Upper Volgian is highly condensed. Modified from Hammer et al. (2011).
Fig. 4 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 4. Belemnoid mega− (Onychites quenstedti Engeser, 1987) and microonychites from the Agardhfjellet Formation (probably Oppdalsåta Member), Upper Jurassic, Spitsbergen. PMO 223.381. A. Photograph. B. Explanatory drawing. Micro−onychites marked as hooks (complete specimens), lines and dots (incomplete specimens). Density of micro−onychites in gray scale, computed using the kernel density method.
Fig. 3 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 3. Belemnoid mega−onychites Onychites quenstedti Engeser, 1987 from Boreal localities. A. PMO 223.380, seep carbonate, earliest Late Volgian, Knorringfjellet, Spitsbergen; entire specimen. B. Close−up of shaft on PMO 223.380, showing rows of circular tubercles. C. PMO 223.378, latest Early Volgian, Janusfjellet, Spitsbergen. D. PMO 223.379, latest Early Volgian, Janusfjellet, Spitsbergen. E. PMO 223.382, Middle Volgian, Janusfjellet, Spitsbergen. F. PMO 210.229, latest Early or early Middle Volgian, well 7/4−1, North Sea. G. PMO 223.383, Late Jurassic, well 34/7−23A, North Sea. H. PMO 74149, Late Jurassic, Andøya, northern Norway.
Fig. 1 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 1. Geological map of the Sassenfjorden area, central Spitsbergen. Sampling locality: 1, Janusfjellet; 2, Knorringfjellet. Redrawn from Dallmann et al. (2001).
Fig. 6 in Large onychites (cephalopod hooks) from the Upper Jurassic of the Boreal Realm
Fig. 6. Morphological terms for mega−onychites, based on Engeser (1987).
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