No abstract
Križna jama (SW Slovenia): Numerical-and correlated-ages from Cave Bear-bearing sediments Križna jama is a large river cave located between Loško and Cerkniško poljes under Križna gora Mount in sout�ern Slovenia. It �as been known since t�e mid-19 t� century due to numerous cave bear finds. The cave is filled by complicated sequences of cave fluvial and lacustrine sediments, w�ic� are recently partly eroded. We studied two paleontological excavations and profiles in t�e Medvedji rov to contribute to t�e solution of dating of bone-bearing lit�ological �orizons. The Križna jama I profile consists of alternation of speleot�em layers (flowstone s�eets wit� small stalagmites, sometimes wit� in situ cemented Ursus gr. spelaeus bones) and fine-grained siliciclastics often wit� bones of cave bear. It can be correlated wit� t�e upper part of t�e Križna jama II profile, but wit� a slig�tly less preserved stratigrap�ic record. Radiocarbon and U-series dates clearly indicate two different ages of cave bear t�anatocenoses in t�e Križna jama I profile: t�ose above flowstone crusts were dated to ca. 47-45 ka by radiocarbon dating; t�ose included in speleot�em layers and clay interbeds are older t�an 94 ka (U-series date). The details of internal lit�ology, low t�icknesses of layers and t�e state of bone preservation exclude expected sandwic�ing of younger layers into eroded/was�ed spaces among flowstones. Numerical dating excludes re-deposition of bear bones from older assemblage to sediments above flowstones. According to t�e paleomagnetic parameters (prevailing normal polarization), t�e deposition took place wit�in Izvleček UDK 902.03:551.435.84(497.4 Križna jama
2) Asma Al-Farraj, Tadej Slabe, Martin Knez, Franci Gabrovšek, Janez Mulec, Metka Petrič, Nadja Zupan Hajna: Karst in Ras Al-Khaimah, Northern United Arab EmiratesThis paper presents karstological prospecting of selected areas in Ras Al-Khaimah Emirate, UAE. Several locations in Musandam Mountains have been explored for caves, karst springs and surface karst features. Two karst springs, Khatt and MeBreda, were analyzed for basic physical, chemical and microbiological parameters. Although they are both recharged from karst aquifers, they differ significantly. The first one is a thermal spring in which infiltrated rain water is mixed with more saline and mineralized water from greater depths. The location of the second one at the high altitude of 710 m a. s. l. is conditioned by the existence of a less permeable zone within a carbonate aquifer with a larger share of dolomite. There were increased concentrations of nitrates probably due to grazing goats around the spring but on the other hand there was surprisingly low number of total bacterial counts; however detected Escherichia coli indicated probable fecal contamination. None of the water from any of the tested sites matched the ISO criteria for direct human consumption. Surface rock relief resulted from different karst processes was studied in river beds and side walls of wadis and on the mountain plateaus. The slopes of the wadis are often dissected by large recesses, relatively rare subsoil forms, and karren with microrills and rain flutes. More extensive karren are found on the tops of the mountains. The rocky riverbeds of wadis were shaped by rapid water currents and corrosion at the contact with sediment. In the study area at the northern slopes of mountains no big cave was found. The largest discovered cave was in fact tectonic fracture which was extended due to the gravitational sliding of part of a mountain along a fissure. But several small (10−20 m long) solutional caves have been discovered and surveyed on the wadis slopes. They exhibit relatively simple assemblage of dominantly deadend passages. Caves are vertically distributed at several levels IzvlečekUDK 551.435.8(536.2) V članku predstavljamo preliminarne krasoslovne raziskave izbranih območij emirata Ras Al-Khaimah, ZAE. Na več lokacijah v Musandamskem gorovju smo raziskovali jame, kraške izvire in kraško površje. Kemične in mikrobiološke analize voda dveh kraških izvirov (Khatt in MeBreda) kažejo na precejšnjo razliko obeh vodozbirnih območij. Khatt je termalni izvir, za katere je značilno mešanje infiltrirane deževnice in globokih mineraliziranih voda. Izvir MeBreda se nahaja na nadmorski višini 710 m in iztekanje vode je pogojeno z manj prepustno dolomitizirano plastjo. Zaradi gorske paše je v vodi precej nitratov, vendar presenetljivo malo celokupnih bakterij. Priso tnost E. coli vseeno nakazuje verjetno fekalno onesnaženost. Nobena analizirana voda ne ustreza ISO standardom za nepo sredno uporabo za pitno vodo. Na gorskih planotah, pobočjih in kori tih vadijev smo proučevali kraške skalne ...
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