*4.1. Description of the Study Sections*

Figure 5 illustrates a general view of the studied sections, regarding the Jurassic-Eocene carbonates of the Ionian zone in the study area. Agios Georgios section consists of 50 m of a uniform, largely condensed shallow-water limestone unit (Figure 5a,b) with calcareous algae, benthic foraminifera, and, rarely, brachiopods. The middle part of this succession (samples L15–L20) is recrystallized and slightly dolomitized, a phenomenum that usually occurred during the Jurassic in the Ionian zone. Such Early Jurassic sediments represent the lower part of the carbonate unit in western Greece. The basal 10 m of Perivleptos section contains neritic Pantokrator Limestones, overlain unconformably by reddish and green organic matter-rich shales with thin- to medium-bedded marly limestone interbeds and siliceous lenses, the Vigla Shales (Figure 5c–e).

**Figure 5.** Outcrop photographs of the study sections along with enlargements indicative of their characteristics: (**a**) General panoramic view of the Agios Georgios section; (**b**) Early Jurassic Pantokrator Limestones of Agios Georgios section; (**c**) general panoramic view of Perivleptos section. The red dashed line marks the unconformity between the lower (Pantokrator Limestones) and the upper (Vigla Shales) part of the section; (**d**) Pantokrator Limestones of the lower part of Perivleptos section; (**e**) Vigla Shales

of the upper part of Perivleptos section; (**f**) general panoramic view of Vigla section; (**g**) enlargement of the Vigla section, showing pelagic limestones and with chert intercalations; (**h**) general panoramic view of Koloniati section; (**i**) Vigla Limestones of the lower part of Koloniati section. The red dashed line marks the unconformity between the lower (Vigla Limestones) and the upper (Senonian Limestones) part of the section; (**j**) Senonian Limestones of the upper part of Koloniati section; (**k**) enlargement of the Vigla Limestones, showing pelagic limestones intercalated with flattened cherty nodules; (**l**) general panoramic view of Asprageli-2 section; (**m**) Senonian Limestones of Asprageli-2 section; (**n**) general panoramic view of Asprageli-1 section; (**o**) Paleocene-Eocene microbrecciated limestones of Asprageli-1 section.

The Vigla section, which has a thickness of 20 m, is characterized by typical Vigla formation deposits, such as pelagic limestones interbedded with centimeter- to decimeter-thick radiolarian chert beds (Figure 5f,g). Koloniati section (60 m thickness) consist of Cretaceous deposits of both Vigla and Senonian Limestones formations separated by an unconformity (Figure 5i). The lower half consists of pelagic massive limestones with rare intercalations of chert beds, and spherical, but also flattened, cherty nodules (Figure 5i,k). The siliceous nodules are beige, or light grey to dark grey color. The lithology of the upper half is described as solid, thick-bedded limestones that can be easily separated from the underlain thin-bedded ones (Figure 5j). In the uppermost part of the section brecciated horizons have been observed. Similar microbreccia bioclastic limestones with roudist fragments were observed in the 10 m thick Asprageli-2 section (Figure 5l,m). Finally, at the top of the studied carbonate succession, the 25 m thick Asprogeli-1 section consists of grey-light micro- to mesoporous, turbiditic limestones with abundant radiolaria and planktonic foraminifera (Figure 5n,o).
