Identification of fossil corals Inhabiting anUplifted Area of Ras Gunz Near Jiwani,Balochistan PakistanAmjad Ali and Pirzada Jamal A. SiddiquiCentre of Excellence in Marine Biology, University ofKarachiaalimbku@hotmail.com
IntroductionA. Jiwani is located on the Balochistan coast of Pakistan (25º02’ 610” N & 61º 44’ 438”E) at about 720 km from Karachiand 60 km from Gwader towards the west.B. About 800 km long Balochistan coast is considered as asubduction zone . The over all convergence and jostling oflarge continental plates have resulted in a complexgeotectonic changes.The convergence and jostling of largecontinental plates has caused complex geotectonic activity.C. These changes are categorized in three phases, themiddle Miocene, late Miocene to mid Pleistocene andmid Pleistocene to recent.D. The area is reported to have a number of fossil mollusksand corals embedded in a variety of lithostratigraphicunits.
Materials and MethodsA. Fossil corals were collected randomly fromuplifted Pleistocene age strata located severaltens of meters above sea-level near Ras GunzB. Small pieces of coral samples were washed withfresh water for detailed examination ofidentifiable taxonomic features.C. The recorded specimens are archived at CEMB,University of Karachi for future reference.
Materials and MethodsD. The overall and magnified images ofindividual samples were recorded using ahigh magnification Sony DSC- W 90 digitalcamera.E. The samples were identified on the basis oftheir primary (growth forms, corallites etc.)and secondary characters (columellacharacters)
.Map of the Pakistan coast showing study site at RasGunz near Jiwani
ResultsA total of 14 specimensof different types ofcorals belong to 2families and 8 generawere identified on thebasis of primary andSecondary characters.
ResultsS. No. Species Family1 Favia truncates? Faviidae2 Favia lizardances Faviidae3 Favia sp.1 Faviidae4 Favia sp. 2 Faviidae5 Favia sp.3 Faviidae6 Favia sp.4 Faviidae7 Favites cf. acuticollis Faviidae8 Favites sp. Faviidae9 Goniastrea cf. retiformis Faviidae10 Platygyra daedalea Faviidae11 Cladocora cf. caespitosa Faviidae12 Cyphastrea serailia Faviidae13 Astreopora sp. Acroporidae14 Acropora sp. AcroporidaeSpecies of fossil corals, identified in Order Scleractinia and two families,collected from an uplifted location at Ras Gunz near Jiwani, Balochistan. Taxonwith a question mark is not identified with certainty
Comparision of Fossil Corals WithModern CoralsA. Currently 30 species of hard corals belong to 2 orders ,9 families and 15genera were recorded.B. None of the fossilized corals identified in this study are represented within the modern species of corals
CommentsThough the number of species describedhere is small but provides evidences forrecent extinctions of corals alongMakran coast