Jurassic clay deposits are distributed almost everywhere in the Moscow region. Clay soils are extremely sensitive systems to changes in geochemical and geophysical fields and therefore undergo profound changes during lithogenesis. Overconsolidation parameters characterize the initial stress-strain state of the rock mass. Jurassic deposits may be in the zone of influence of the designed structures, for the calculation of settlements of which nonlinear models of soil behavior are used. Due to the history of geological development of the Moscow region, which includes several glaciations, an important characteristic of clayey rocks is their degree of overconsolidation. As a result of the study, the behavior of these soils was studied and processed using various graphical methods. The samples were taken on the territory of Moscow (Fadeeva St. and Desenovskoe village) from a depth of 7.7 to 23.8 m and belong to the Oxfordian stage of the Jurassic system, being marine sediments. For the selected samples, the particle size distribution, chemical and mineral composition, and physical properties were determined. The mineral composition is dominated mainly by smectites (38.5-46.5%). In accordance with the classification according to GOST 25100-2020 according to the degree of salinity, the studied soils are distinguished from non-saline to slightly saline (0.40-0.71%), the type of salinity is marine. Based on the relative swelling strain without load, soils are classified from moderately swelling to highly swelling (10.6-38.9%). The soils under study are classified as heavy semi-solid clays (plasticity number 42-58%, fluidity index from 0.07-0.24 units). Overconsolidation coefficient OCR for Oxfordian clays at st. Fadeev ranged 2.1-8.1, which corresponds to overconsolidated and highly overconsolidated soils, and in Desenovskoye 1.2-1.9, that is, normally compacted soils according to the GOST 25100-2020 classification. The POP overconsolidation stress ranged 92-394 kPa and 175-1768 kPa, respectively. Thus, the data obtained indicate that historical stresses exceeded modern ones.