The subsurface middle Eocene - early Miocene succession in the N. El Faras - 1X Well, drilled in the Qattara Depression at the northern part of the Western Desert, Egypt (Southern Tethyan Province, STP), was studied for its ostracode content to infer changes in paleobathymetry as well as paleobiogeographic reconstructions. This succession is composed mainly of three lithostratigraphic units, as the upper part of the Apollonia Formation (middle to late Eocene), the Dabaa Formation (late Eocene and Oligocene) and the lower part of the Moghra Formation (early Miocene). The stratigraphical distribution, paleoenvironmental and paleobiogeographical significance of the ostracode faunas from the Oligocene interval of the study area are documented for the first time. Fifty seven ostracode species belonging to 36 genera were identified in this succession. Among them, two new species were described. The vertical distribution of these ostracode species enabled the recognition of seven local biozones. Qualitative and quantitative statistical analysis of ostracode associations revealed a depositional depth ranging from the inner to outer neritic setting. Considering the CONISS cluster analysis, six ecozones were established. During the middle and late Eocene, the paleobiogeographical affinities of the Egyptian ostracodes from N. El Faras-1X× Well succession with that of the Southern Tethyan countries suggest a direct connection between Egypt and the countries of the Southern Tethyan Province. This connection facilitated the dispersal and exchange within this province. The low ostracode similarity between the STP and the Northern Tethyan Province (NTP) suggests a slight connection and exchange between them. The in common occurrence of these ostracodes with that of Somalia is attributed to the connection between the STP and Somalia via the Tethyan Seaway, which facilitated the dispersal and exchange of the middle Eocene ostracodes. The similarity between the Egyptian ostracodes (STP) and that of South America and the Caribbean Sub-Province indicates a direct connection between those provinces across the Gibraltar Strait and through the North Equatorial Oceanic Water Current during that time. During the Oligocene, the low ostracode similarity between the STP and the NTP may be attributed to a more or less restricted connection. Also, the low similarity indicates a continuation of the mild connection between the STP and the South America and Caribbean Sub-Province across the Gibraltar Strait and through the North Equatorial Current. During the early Miocene, the similarity of the recorded ostracodes of the STP with that of the NTP suggests a continuous connection between the two provinces. Also, there was a connection between the South America and Caribbean Sub-Province and the North American Province through the North Equatorial Current and the warm Gulf Stream within the Caribbean Sea.

研究了在埃及西部沙漠北部（南特提斯省，STP）卡塔拉洼地钻探的 N. El Faras 地下中始新世 - 早中新世地层 - 1X 井的介形码含量以推断变化在古水深测量以及古生物地理重建中。该层序主要由三个岩石地层单元组成，即阿波罗尼亚组上部（始新世中晚期）、达巴组（始新世晚期和渐新世晚期）和莫格拉组下部（中新世早期）。首次记录了研究区渐新世介形动物群的地层分布、古环境和古生物地理意义。共鉴定出 36 属 57 种介形虫。其中，描述了两个新物种。这些介形虫物种的垂直分布使得能够识别七个当地生物区。介形板关联的定性和定量统计分析揭示了从内部浅海环境到外部浅海环境的沉积深度。考虑到 CONISS 聚类分析，建立了六个生态区。始新世中晚期，来自N. El Faras-1X×井演替的埃及介形类与南特提斯国家的古生物地理亲缘关系表明埃及与南特提斯省国家之间存在直接联系。这种联系促进了该省内的分散和交流。STP 和北特提斯省 (NTP) 之间的低介形码相似性表明它们之间存在轻微的联系和交换。这些介形虫与索马里的共同出现归因于STP通过特提斯海道与索马里相连，这促进了始新世中期介形虫的传播和交换。埃及介形码 (STP) 与南美洲和加勒比副省之间的相似性表明，直布罗陀海峡对面的这些省份与当时的北赤道洋流之间存在直接联系。在渐新世期间，STP 和 NTP 之间的低 ostracode 相似性可能归因于或多或少的受限连接。还，低相似性表明 STP 与南美和加勒比地区之间穿过直布罗陀海峡并通过北赤道洋流的温和联系仍在继续。在中新世早期，STP 与 NTP 记录的 ostracodes 的相似性表明这两个省之间存在持续的联系。此外，南美洲和加勒比副省与北美省之间通过北赤道洋流和加勒比海内温暖的墨西哥湾暖流相连。