Elemental Composition

Energy Dispersive X-Ray Microanalysis (EDAX) showed that the siphonal tube of Quenstedtoceras is rich in phosphorus, while the shell and septa are made of

Fig. 12.1 Quenstedtoceras sp. A - General view of connecting ring. B - Vertical fracture plane of the connecting ring. C - Detail of B in higher magnification to show the granular structure of the glycoprotein fibers and the pore canals. Scale bars: A - 0.1 mm; B, C - 6flm.

calcium carbonate. A total of 25 points were analyzed as follows: 8 points on the outer surface of the shell and inner surface of the septa, 16 points on the connecting ring and 1 point on the septal neck. The analysis results are shown in Table 12.1.

Fig. 12.2 A, B. Aconeceras trautscholdi. A - Vertical fracture plane of connecting ring to show pore canals. B - Detail of A in higher magnification. C, D. Grammoceras quadratum. C - Vertical fracture plane of connecting ring to show the outer sublayer with compact structure and the inner sublayer with less compact structure. D - Detail of C in higher magnification to show the pore canals. E-G. Quenstedtoceras sp. E - Vertical fracture plane of connecting ring to show the two sublayers. F, G - Outer and inner sublayer, respectively, in higher magnification to show the granular structure of glycoprotein fibers and pore canals. Scale bars: A, C, E - 12¡mm; B, D - 6¡mm; F, G - 3 ¡mm.

Fig. 12.2 A, B. Aconeceras trautscholdi. A - Vertical fracture plane of connecting ring to show pore canals. B - Detail of A in higher magnification. C, D. Grammoceras quadratum. C - Vertical fracture plane of connecting ring to show the outer sublayer with compact structure and the inner sublayer with less compact structure. D - Detail of C in higher magnification to show the pore canals. E-G. Quenstedtoceras sp. E - Vertical fracture plane of connecting ring to show the two sublayers. F, G - Outer and inner sublayer, respectively, in higher magnification to show the granular structure of glycoprotein fibers and pore canals. Scale bars: A, C, E - 12¡mm; B, D - 6¡mm; F, G - 3 ¡mm.

Fig. 12.3 A. Aconeceras trautscholdi. Vertical and horizontal cross sections of a connecting ring to show the pore canals. B. Carcinus maenas (Crustacea). Horizontal fracture plane of the exoskeleton to show the pore canals and glycoprotein fibers. C. Quenstedtoceras sp. Oblique vertical fracture plane of the connecting ring to show granular structure and pore canals. Scale bars: A, B -10mm; C - 1 mm.

Fig. 12.3 A. Aconeceras trautscholdi. Vertical and horizontal cross sections of a connecting ring to show the pore canals. B. Carcinus maenas (Crustacea). Horizontal fracture plane of the exoskeleton to show the pore canals and glycoprotein fibers. C. Quenstedtoceras sp. Oblique vertical fracture plane of the connecting ring to show granular structure and pore canals. Scale bars: A, B -10mm; C - 1 mm.

Fig. 12.4 A-D. Quenstedtoceras sp. A - General view of connecting ring with several siphuncular sheets. B - Granular surface of siphuncular sheet. C - Detail ofthe vertical fracture plane ofthe connecting ring and siphuncular sheet. D - Siphuncular sheet in higher magnification. Scale bars: A - 300mm; B - 30mm; C - 12mm; D - 3mm.

Fig. 12.4 A-D. Quenstedtoceras sp. A - General view of connecting ring with several siphuncular sheets. B - Granular surface of siphuncular sheet. C - Detail ofthe vertical fracture plane ofthe connecting ring and siphuncular sheet. D - Siphuncular sheet in higher magnification. Scale bars: A - 300mm; B - 30mm; C - 12mm; D - 3mm.

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