## 4 Results
### Shape and Morphometry of Hydration Landforms
It stands out from the others with its strongly elongated shape, the morphology of a pressure ridge, a tepee-like shape in cross section, and an outstanding relative height of 2.08 m. On the other hand, the shortest documented form is 1.86 m long and has almost the lowest relative height of 0.35 m. It is a form with a distinct tepee shape and characteristic concave bending of detached layers (no. 66, Tables 2 and S1, Figures 4 and S2). According to general shape, 52 dome- and 25 tepee-like forms were distinguished, representing 67.5% and 32.5% of all the studied objects (Table S1). The relative heights of the landforms range from 0.33 to 2.09 m (Table 2), and half of the recorded values range from 0.56 to 1.05 m. Again, using the frequency distribution of the relative heights, two limits of 1.0 and 1.5 m were determined within the low-frequency intervals on the histogram, and considering these limits, the forms were classified into three groups: the low forms (72%), the medium height forms (22%), and the high forms (7%) (Figures 6 and S5). The highest hydration form shows a relative height of 2.09 m and is characterized by a domed shape (no. 49, Figures 4 and S2, Table S1). Such a large height of that form corresponds to the largest area of the internal cave, 29.4 m\({}^{2}\) (the Damian Cave [61]). The width of the landforms appears to change proportionally to their length, except for the most elongated forms represented by the two pressure ridges (no. 3 and no. 17, Figure 6). Similarly, the relative height seems to change proportionally to both the length and width of the forms (Figure S6). The linear correlation between the discussed parameters can be expressed by the following equations, characterized by relatively large values of correlation (Pearson) coefficients (r), indicating moderate correlation (Figures 6 and 8) [95] (p. 529). [PERSON] [48] obtained the best correlation between the height and the width of the forms (expressed by the ratio height/width \(\approx\) 0.16, \(n\) = 69). Our data suggest the best correlation between the length and the width (Figures 6 and 8). The frequency distribution of b/h\({}_{\rm r}\) ratio shows that the average bulge degree of the studied forms is 4.28 (Table 2, see Figure S5). This parameter has an exceptionally high value of 8.58, indicating the least convex form, with a relative height ca. eight times less than its width (no. 68, Figure 9a, Table S1). In spite of its flatness, this form has an internal hydration cave, which is a proper cave with a proper entrance sensu Curl [96; 97; 105], i.e., an open cavity large enough to crawl inside by a man. On the other hand, the lowest value of bulge degree 1.82, indicating the greatest convexity, is recorded in the typical tepee-shaped form with a relative height of only ca. two times less than its width and created by two rock slabs leaning against each other (no. 15, Figure 9b and Figure S2, Table S1). This strongly bulged form also currently has an internal cave (in 2019), reaching 1.27 m in height (the Personal Grotto, Figure 9b). The height of this cave continues to rise (Figure 13 in [9]). Generally, it can be noticed that, on average, the tepee-shaped forms have a slightly higher convexity (average b/h\({}_{\rm r}\) is 3.69) than dome-shaped forms (average b/h\({}_{\rm r}\) is 4.51; see Figure S5). The degree of bulge does not correlate with the length of the forms in a linear manner (Figure 10a). Such a correlation is also weak between bulge degree and width (Figure 10b) and bulge degree and coefficient of circularity (Figure 10c). Generally, it is seen that the higher convexity is reached by forms with a smaller length (Figure 10a), and the lower bulge degree by forms with a smaller width (Figure 10b). Figure 10: _Cont._  
Figure 9: Anhydrite hydration landforms with extreme values of bulge degree (b/h\({}_{\rm r}\) ratio); (**a**) form no. 68 with the highest value of bulge degree visible on the 3D model; (**b**) form no. 15 with the lowest value of bulge degree.