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7 results for “Karoo Basin”
Fig. 5 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa
Fig. 5. Transverse section of the rib (BP/1/5409) of cf. Jonkeria sp. from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, overall view of the rib showing the highly cancellous nature of the cortex; note that only the top area of the section preserves the compact cortical bone tissue. A2, A3, detail showing slight change in the tissue type around the lines of arrested growths but overall matrix is woven; note: numbers associated with arrowheads indicate lines of arrested growth (LAGs) in ascending order from the medullary region to periosteal periphery. A4, detail showing enlarged erosional cavities (inset). A5, detail showing fibrolamellar bone between lines of arrested growth. A6, detail showing dense woven matrix; note the change in the density of osteocyte lacunae around the LAG (number associated with arrowhead indicates LAG). Abbreviation: wb, woven bone. Photographs under ordinary light (A1, A3, A4, A5), and cross-polarized light with lambda compensator (A2, A6).
Fig. 2 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa
Fig. 2. Transverse sections of the radius (SAM-PK-12233b) of Jonkeria parva (Boonstra, 1955) from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, diaphyseal cross-section showing highly vascularized fibrolamellar bone tissue in the outer cortex and the medullary cavity filled with bony trabeculae; note: the numerous enlarged resorption cavities in the perimedullary region. A2, detail showing an annulus with lamellar bone (arrowhead). A3, detail showing extension of an annulus in the cortex (arrowhead). B1, fibrolamellar bone tissue with woven matrix in the outer cortex showing circumferential and reticular organization of the vascular canals; B2, B3, detail showing the change to a reticular organization of the vascular canals. Abbreviations: mr, medullary region; po, primary osteon; tb, trabeculae; wb, woven bone. Photographs under cross-polarized light with lambda compensator (A1–A3, B1, B2) and ordinary light (B3).
Fig. 4 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa
Fig. 4. Thin section of a core of the humerus (SAM-PK-11994) of Jonkeria ingens (Broom, 1923) from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, overall view of humerus showing laminar fibrolamellar bone in the outer cortex and the increasingly cancellous nature of the bone towards the medullary cavity; note: numerous enlarged resorption cavities in the perimedullary cavity, and the layer of indurated sediments at the top of the section. A2, A3, highly vascularized laminar fibrolamellar bone. A4, A5, details showing a few isolated simple longitudinal vascular canals and primary osteons. A6, A7, detail showing large resorption cavities lined by narrow deposit of lamellar bone (arrows). Abbreviations: po, primary osteons; rc, resorption cavity; wb, woven bone. Photographs under ordinary light (A1, A2, A4, A6), and cross-polarized light with lambda compensator (A3, A5, A7).
Fig. 3 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa
Fig. 3. Transverse sections of the tarsal (SAM-PK-12233c) of Jonkeria parva (Boonstra, 1955) from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, diaphyseal cross-section showing highly vascularized fibrolamellar bone tissue in the outer cortex and cancellous bone tissue with extensively developed bony trabeculae in the medullary cavity; note: numerous enlarged resorption cavities in the perimedullary region. A2, detail showing highly vascularized reticular FLB. A3, A4, detail showing simple longitudinal vascular canals. A5, A6, detail showing reticular vascular canals. Photographs under cross-polarized light with lambda compensator (A1–A3, A5) and ordinary light (A4, A6).
Fig. 6 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa
Fig. 6. Longitudinal section of the rib (BP/1/5409) of cf. Jonkeria sp. from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, overall view of the rib showing highly secondarily remodeled cortex; note: numerous enlarged resorption cavities. A2, detail showing woven bone and enlarged resorption spaces. Photographs under ordinary light (A1) and cross-polarized light with lambda compensator (A2).
Fig. 5 in A new mid-Permian burnetiamorph therapsid from the Main Karoo Basin of South Africa and a phylogenetic review of Burnetiamorpha
Fig. 5. Burnetiamorpha gen. et sp. indet. (BP/1/7098) from Springfontein, Beaufort West district, South Africa; upper Poortjie Member, Pristerognathus AZ, latest Capitanian. A. Anterior palate in ventral view, black arrow shows direction of view in B; white arrows show lateral displacement of interchoanal portion of the vomers. B. Interchoanal portion of vomers in right ventral view (B), showing the continuation of the downturned edges of the vomer extending anteriorly onto the premaxilla; pmr, ventral ridge of premaxilla at anterior margin of choana; vrl, ventral ridge of vomer laterally flared; vrm, ventral ridge of vomer medially folded. C. Specimen in posterior view. Photographs (A1, C1) and explanatory drawings (A2, C2).
Fig. 3 in A new mid-Permian burnetiamorph therapsid from the Main Karoo Basin of South Africa and a phylogenetic review of Burnetiamorpha
Fig. 3. Burnetiamorpha gen. et sp. indet. (BP/1/7098) from Springfontein, Beaufort West district, South Africa; upper Poortjie Member, Pristerognathus AZ, latest Capitanian; in dorsal (A) and left lateral (B) views. Photographs (A1, B1) and explanatory drawings (A2, B2).
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