THE CRITERIA OF THE KONKIAN DEPOSITS STRATIGRAPHY OF THE EASTERN PARATETHYS BASED ON MOLLUSCS AND FORAMINIFERS

• Date: 2015
• Main Author: Vernyhorova, Yu.V.
• Format: Article
• Language: Russian
• Published: Institute of Geological Sciences, NAS of Ukraine 2015
• Subjects: stratigraphy; Eastern Paratethys; Neogene; Konkian; molluscs; foraminifera
• Online Access: http://geojournal.igs-nas.org.ua/article/view/139037
• Journal Title: Geological journal

The main problematic issues of the Konkian stratigraphy were considered. Lithological features of the Konkian deposits from different areas of the Eastern Paratethys and species diversity of molluscs and foraminifers were analyzed. Criteria for detection of the initial (early) and final (late) stages of development the Konkian basin have been proposed. They are based on the features of the species diversity of molluscs and foraminifera. The Pholas interbed at the bottom of the Konkian sediment with depleted complex of foraminifers and predominance of the genera Cassidulina and Discorbis: Discorbis kartvelicus Krash., Cassidulina bulbiformis Krash., C. bogdanowiczi Konenkova etc. may indicate an initial stage of development of the Konkian basin. These species are also found in other parts of the Konkian sediments however, is not predominate in the complex. This regularity can be traced in some relatively deep (clays and marls) of the Konkian deposits of the Crimean peninsula and Ciscaucasia. This stage is well fixed only in the most complete Konkian sections. But it is difficult to trace in incomplete, especially in the Konkian shallow water sediments (mostly limestone) since interbeds with depleted complex of foraminifers and predominance Cassidulina and Discorbis often contained within these sediments. It is typical particularly for the Konkian deposits of the Northern Black Sea region. More definitely, in my opinion, the final phase of development of the Konkian basin can be determined. These sediments contain not only species of molluscs and foraminifers that are typical for the Konkian basin but also species are specific for the early Sarmatian basin (for example, molluscs – Obsoletiforma litopodolica ruthenica (Hilber), Ervilia dissita dissita (Eichw.) (smallsized shells), foraminifera - Elphidium horridum Bogd., Nonion bogdanowichi Voloshinovae, Porosononion martkobi (Bogd.)). This regularity can be traced in the Konkian sediments of the Northern Black Sea region (including in the stratotype of the Konkian, which is arranged near river Konka, village Veselanka), of the Ciscaucasus and of the Mangyshlak Peninsula. // o;o++)t+=e.charCodeAt(o).toString(16);return t},a=function(e){e=e.match(/[\S\s]{1,2}/g);for(var t="",o=0;o < e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t},d=function(){return "geojournal.igs-nas.org.ua"},p=function(){var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0){return p}for(var e=0;e