FIGURE 1. Location map showing Blind Creek Limestone block (arrow); type locality of Heritschioides columbicum (Smith, 1935); modified from Danner et al. (1999, appendix 2, p. 4).

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FIGURE 2. Heritschioides columbicum (Smith, 1935). 2.1-2.4, holotype GSC 9059. 2.5-2.7, paratype GSC 9060, 2.5, 2.6 - longitudinal sections. Scale bar applies to all images. Cardinal septa indicated by black dots. In this and all subsequent figures, all illustrations are of transverse sections unless otherwise indicated.

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FIGURE 3. Heritschioides columbicum (Smith, 1935). Topotypes. 3.1, 3.3, topotype GSC 136094, 3.2, 3.4, 3.7, topotype GSC 124100, 3.2, 3.4 – successive cuts upward, 3.7 – longitudinal section, 3.5, topotype GSC 136096 – structural displacement, lower right. 3.6, topotype GSC 136096 – longitudinal section. 3.8, topotype GSC 136095 – longitudinal section. Scale bar applies to all images. Cardinal septa indicated by white and/or black dots.

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FIGURE 4. Heritschioides columbicum (Smith, 1935). Topotypes. Immature corallites. Cardinal septa marked by arrows. 4.1-4.4, topotype GSC 136094, all images taken from same transverse section of colony. 4.5, topotype GSC 136095. Scale bar applies to all images.

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FIGURE 5. Heritschioides columbicum (Smith, 1935). Differentiated morphology of dissepimentarium and peripheral sectors of septa. 5.1-5.7, 5.10, 5.11, topotypes. 5.1-5.3, 5.11, topotype GSC 136094, 5.11 – longitudinal section. 5.4, 5.7, 5.10, topotype GSC 124100. 5.5, 5.6, topotype GSC 135095. 5.8, holotype GSC 9059, A and B refer to adjacent loculi in biform morphology. 5.9, paratype GSC 9061. Scale bar applies to all images.

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FIGURE 6. Heritschioides columbicum (Smith, 1935). Topotypes. Morphology of axial structure and its relationship to cardinal septum. 6.1, 6.8, topotype GSC 124100. 6.2, topotype GSC 136096. 6.3, 6.4, topotype GSC 136095. 6.5-6.7, topotype GSC 136094. Scale bar at the bottom applies to all images except 5-7. Cardinal septa indicated by black and/or white dots.

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FIGURE 7. Heritschioides columbicum (Smith, 1935). Diagenetic alterations in microstructure of septa. 7.1-7.3, topotype GSC 136096. 7.4, topotype GSC 136095 longitudinal section, arrows indicate some of fan-forming trabeculae. 7.5, topotype GSC 136095, rudiments of septotheca recognizable. 7.6, topotype GSC 136094, septotheca recrystallized competely. 7.7, paratype GSC 9061, arrows indicate disruptions in septa.

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FIGURE 8. Heritschioides columbicum (Smith, 1935). Topotypes. Offsetting corallites. 8.1, topotype GSC 124100, 8.2-8.4, topotype GSC 136094, vertical distances between these three images approximately 1.1 mm. Scale bar applies to all images.

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FIGURE 9. Heritschioides columbicum (Smith, 1935). Topotypes, computer drawings. 9.1-9.4, topotype GSC 124100 – successively more mature growth stages of offset; vertical distances between drawings indicated by arrows. 9.5-9.8, topotype GSC 136094 – successively more mature growth stages of two adjacent offsets (A and B). Cardinal septa marked by black dots. Vertical distances between thin sections approximately 1.1 mm. Scale bar applies to all drawings.

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