Articles
Publication Date: 2025
Bulletin of Geosciences (12141119)100(2)pp. 187-211
The Persian Gulf is the remains of an ancient seaway that connected the Indo–Pacific Region to the Mediterranean– Atlantic Region and the Paratethys Ocean. The Mishan Formation in Zagros Basin, Qeshm Island (Persian Gulf), and the Miocene strata of Minab Province in the Makran Basin, southern Iran, have yielded a rich fauna of bryozoans. A total of 22 species are here identified from four sections of in the Qeshm and Minab areas, including 13 species belonging to the order Cyclostomata, and 9 species belonging to the order Cheilostomata. The distribution and occurrences of the bryozoan fauna show the studied intervals were deposited during Early to Middle Miocene while the Iranian Seaways was connected to the Indo–Pacific Region from southeast, and to Mediterranean–Atlantic Region from northwest. Also, the most similar occurrences of the species described are with bryozoan faunas of the Paratethys Ocean. • Key words: Bryozoa, Miocene, Iran, taxonomy. © 2025, Czech Geological Survey. All rights reserved.
Publication Date: 2025
Journal of Stratigraphy and Sedimentology Researches (20087888)41(3)pp. 17-40
Land subsidence represents a severe environmental hazard, causing significant infrastructure damage and threatening cultural heritage sites. The Isfahan–Borkhar region of central Iran, with its dry climate and diverse topographical conditions, has been highly susceptible to this phenomenon. Using remote sensing techniques, particularly radar interferometry (InSAR), this study investigates subsidence rates over the 2019–2023 period. Advanced machine learning methods, namely Decision Tree (DT), Random Forest (RF), and Extreme Gradient Boosting (XGBoost) are employed to develop a susceptibility map divided into five probability classes: very high, high, medium, low, and very low. The analysis incorporates 145 Sentinel-1 radar satellite images and factors such as elevation, groundwater levels, rock composition, vegetation cover and fault proximity. Among these, RF emerges as the most effective algorithm, achieving a classification accuracy of 95.63%, while XGBoost proved inefficient for certain critical subsidence zones. Results reveal that subsidence risk is concentrated in the central and eastern parts of the region due to excessive groundwater extraction and geological vulnerabilities. Conversely, the western and northwestern areas exhibit lower risk due to stable geological formations and controlled groundwater usage. These findings aim to inform regional planning and subsidence mitigation strategies. © 2025 University of Isfahan.
The present study investigates the pectinid bivalve record characterizing the Mio-Pliocene of Mishan and Aghjari formations in Qeshm Island of the Persian Gulf and Minab region of Makran Basin (Hormozgan Province). Thick-bedded deposits of highly accumulated levels of epifaunal free-lying pectinids were investigated in terms of paleoecology and taphonomy. Eight species of the family Pectinidae (Bivalvia) and nine species of Ostracoda are reported from the Direstan rural area, Qeshm Island, Persian Gulf, Southern Iran. Most bivalve shells display extreme taphonomic features such as breakage, bioerosion, encrustation, disarticulation, and abrasion. Encrusting Cheilostomata bryozoans, as well as polycheata worms, encrust pectinid valves; Langian (Middle Miocene) Cheilostomata are identified as Microporella berningi. The studied pectinids are represented by the following species: Pecten aff. rotundatus, Pecten cf. subarcuatus, Flabellipecten piramidesensis, Argopecten gratus, Chlamys varia, Chlamys multistriata, C. actinodes, and Talochlamys articulata. Ostracoda were also collected from two more outcrops in Qeshm Island (Kendaloo and Star Valley) and one outcrop of Minab region (Bemani section). The studied ostracods are: Alocopocythere kendengensis, Actinocythereis iraqensis, Loxoconcha hamrinensis, Neomonoceratina iniqua, Bairdoppilata triangulata, Bairdia rafidainensis, Hermanites transversicoststs, Costa tricostata, and Cytherelloidea hamrinensis. © (2025), (Boletin de la Sociedad Geologica Mexicana). All rights reserved.
