. Bulletin of the Natural History Museum Geology. LATE CAMPANIAN-MAASTRICHTIAN CORALS 95 North 2 Km i â i. Fig. 3 Detailed locality map for Jebel Huwayyah and Jebel Bu Milh. Class ANTHOZOA Ehrenberg, 1834 Subclass ZOANTHARIA Blainville, 1830 Order SCLERACTINIA Bourne, 1900 Suborder ARCHAEOCOENIINA Alloiteau, 1952 Family ACTINASTREIDAE Alloiteau, 1952 Genus ACTINASTREA d'Orbigny, 1849 Type SPECIES. Astrea geminata Goldfuss, 1826. Actinastrea bastidensis Alloiteau, 1954 PI. 1, fig. 2 *1954 Actinastrea bastidensis Alloiteau: 84-87, pi. Ill, fig. 4, pi. X, fig. 4. vl998 Actinastrea bastidensis All
. Bulletin of the Natural History Museum Geology. LATE CAMPANIAN-MAASTRICHTIAN CORALS 95 North 2 Km i â i. Fig. 3 Detailed locality map for Jebel Huwayyah and Jebel Bu Milh. Class ANTHOZOA Ehrenberg, 1834 Subclass ZOANTHARIA Blainville, 1830 Order SCLERACTINIA Bourne, 1900 Suborder ARCHAEOCOENIINA Alloiteau, 1952 Family ACTINASTREIDAE Alloiteau, 1952 Genus ACTINASTREA d'Orbigny, 1849 Type SPECIES. Astrea geminata Goldfuss, 1826. Actinastrea bastidensis Alloiteau, 1954 PI. 1, fig. 2 *1954 Actinastrea bastidensis Alloiteau: 84-87, pi. Ill, fig. 4, pi. X, fig. 4. vl998 Actinastrea bastidensis Alloiteau; Baron-Szabo: 129, pi. 1, fig. 5. Material. AZ 48; AZ 639 (two specimens). Measurements, d: (*) mm; c-c: mm; s: 24 (*+s4); size of the colony: domal shaped: 7 cm in height, with a varying diameter of about 4 to 5 cm; knobby: ^4 cm in diameter. Description. Massive-domal, or knobby, cerioid corallum with calices that are directly united by their walls. Corallites are poly- gonal in outline. Gemmation is due to extracalicinal and to a lesser extent intracalicinal budding. Costosepta are compact, nonconfluent or subconfluent, and arranged in 3 cycles in 6 systems, radially and bilaterally. Septa of the first cycle extend to, and may fuse with, the columella. Septa of the second cycle are nearly of the same length, but distinctly thinner. Septa of the third cycle regularly alternate with the second cycle septa. In some calices the beginning of a fourth cycle is present. Lateral surfaces of the septa are covered with spiniform and rounded granules. The columella is styliform. The wall is septothecal with lacunae. Endothecal dissepiments are thin and vesicular. Microstructure is poorly preserved, but in places mini- or medium-sized centres of calcification are present. Occurrence. Simsima Formation, lowest 2 m, Jebel Faiyah, 5 km north of Al Madam; outcrop on the east face, ca. 3 km north of the southern tip of Jebel Faiyah, NNE of Al Madam. Distribution
Size: 1375px × 1817px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bhlconsortium, book, bookcollectionbiodiversity, bookleafnumber13
