Permiyen-Triyas geçişinin foraminifer topluluk ortak menzil zonları yardımıyla saptanmasına ilişkin bir örnek (Aladağlar Bölgesi, Doğu Toroslar)

Aladaf regton, iiroıınd Kii^iiksıı and IMidëken yayla, TJppeırmost Permian, Poııninıi-TriasHİc. transition, and Lowermost Triasslo a re repreBented by marine Umestone sequences, la order to clarify the oharaoterlstio iof rermian-Triïissio trasiNitioıı, au Investigatton to define formnlnUera population concmwnt range zones has been carried out In thèse sequences. In the sequence where no stratigraphie hiatus could be found, the par!» corresponding to the zones exhtMt different facie». The lower p a rt consisting of htoclastic, dark-brown limestones at Uppermost Permian age contains foraminifera i»f Dagmarlta chanakohfensta Keitlinger, dlolnvalvulina voııdersclııııitü Ileichel, Staffellai »p., FiM'hyphïoï» »p., Faradagmorlta sp,, Kamurana sp, and atgael fragments like (.Syinnoco dlum sp, t PennocalonluB sp, and Mi'/v.in, sp. This pa rt Is defined as the first foraminifera population concurrent range zone. The seeoiMl p a rt wlii<h overlies the lower pa rt with a gradual transition, ci m suits of brown-yeUinw oolitic limestones of Uppermost Pt^rmiiin-l.<Kvverni»st Triassfo age. In this part, which 1B defined as the second foramtaüıfera population eianourrent range «one, Dagmarita sp,, Paehypholfe sp, anfl * Oyelogyra sp. have been found In the core» of o»Utes and Cyologyra ? mahajeri Ho to ftm cement. The pa rt above consistingof yenow-Tgray limestones mt Lowermost Permian age contains Cyologyra Î mahajer^, Üeetocornusplra Icalhori Bröniimiann, Zaninetti and Bozorgnla, Ammodtecus parapriscus. Ho, Glomosplrella sp., Barlandla sp, and Harlandinita sp, an it is defined as the third foraminifera population concurrent range zone. The upper. nvMt p a rt consisting- of light-gray limestones which a re laminated In i ts lower sections and thick bedded 1B ite upper sections contains Meandosplra pusllle (Ho), Glonu»plreUa sp. Thus, it is defined em the fourth foriiminiferu p()pulati<m cancuiTent range zone. As a result, It M shown that around KÜettksu and I>is<lök-cıı yayla in Aladağ region the Permlam. Triassl« transition te gradatioaal by mean» of the defined foraminifera population concurrent range zone».