This article presents new data from geochronological study the lake-bog organic-rich layer from of the “Ilya Prorok” sequence (Upper Volga Basin, Tver Region) that is a one of the reference sections located on the Russian Plain. Ideas concerning the age and climatic conditions of these organic-mineral deposits formation changed significantly over the long history of their study. As a result, the viewpoint about the belonging of this layer to the Likhvin time began to prevail. However, it is still unclear with which marine isotope-oxygen stage (MIS) the Likhvin interglacial can be compared. According to the paleobotanical study of the lake-bog from the Ilya Prorok section, it was confirmed that the lower part of the lake-bog layer can be attributed to the warm phases of the Likhvin interglacial, while its upper half was deposited during the transition to cooling after the interglacial period. For the first time, the radioisotope age of the buried lake-bog deposits of the reference section “Ilya Prorok” have obtained. According to the data of direct 230Th/U dating, the formation of the sequence probably began no earlier than ~ 326–260 Kyr ago. The 230Th/U age of the buried peat bog from its upper half, according to the results of applying the isochronous approximation, can be correlated with the interval ~256–225 Kyr ago. According to these data, the Likhvin deposits were formed no earlier than MIS-9.

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The article presents microclimate parameters registered on workplaces of gas industry outdoor workers during summer in Astrakhan region as well as equations for calculation of external thermal load and for correlation relationship between external thermal load and functional status of worker (with regard for age and weight). The paper shows dynamics of thermal load on work-er’s body and health during a shift. Factor structure is defined for health characteristics bound to high external temperature, activation of thermoregulation mechanisms, cardiovascular system, and exhaustion. Analysis of health indexes dynamics gives basis for definition of preferable du-ties. According to workers and their functional state assessment average air temperature of 35,3±3,3 °С is defined as unfavorable, 38,5±0,4 °С – as problematic. The most preferable (71% of answers) shift schedule includes alternation of periods of work and rest (in the shade). Reduced shifts and regulation of periods of work and rest are preferred by 14,6% working. Suggestions for improvement of hygienic and ergonomic indexes of PPE are presented on the basis of the questionnaire.