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Several locations along the southern margin of the Ljubljana Moor have been proposed as sites of antique Roman quarries, but except for the site in the village of Podpeč, no detailed sedimentological investigations, which would reveal the spectrum of available natural stone, have yet been made. This paper presents a section logged at the potential Roman quarry from the small valley southeast of the village of Staje near Ig. The section is composed of Sinemurian strata dominated by micritic limestone with dissolution voids and bioclastic limestone, mostly wackestone with mollusks. Other facies are rare aggregate-grain/ooidal calcarenite, lumachella, limestone microbreccia, and stromatolitic limestone. Altogether, 21 microfacies types are described. Facies association points to sedimentation in restricted and open marine lagoon repeatedly subjected to emersion, rarely high-energy conditions or events. Previously unrecorded on the Dinaric Carbonate Platform in this area are neptunian dykes that occur as fractures partially filled by calcite cement and partially by intra/bioclastic packstone containing upper Jurassic microfossils. These could potentially serve as a diagnostic feature for recognizing artefacts made from stone quarried at Staje. Izvleček Do sedaj je bilo vzdolž južnih obronkov Ljubljanskega barja predlaganih nekaj lokacij kot domnevno rimskih kamnolomov, vendar nobena izmed teh, razen Podpeči, ni bila detajlno sedimentološko raziskana. Spekter dostopnega naravnega kamna tako ostaja dokaj slabo poznan. V tem prispevku predstavljamo profil, ki je bil posnet na območju morebitnega rimskega kamnoloma v majhni dolini jugovzhodno od vasi Staje pri Igu. Profil sestavljajo spodnjejurske, natančneje sinemurijske plasti, v katerih prevladujejo mikritni apnenci z dvema generacijama korozijskih votlinic in bioklastični apnenci, večinoma tipa wackestone z mehkužci. Ostali faciesi so redki kalkareniti z agregatnimi zrni ali ooidi, lumakela in apnenčeva mikrobreča. V raziskanem zaporedju izdvajamo 21 mikrofaciesnih tipov. Faciesna združba kaže na sedimentacijo v zaprti in občasno odprtomorski laguni, ki je bila podvržena ponavljajočim se okopnitvam, redko pa tudi višjeenergijskim razmeram ali dogodkom. Raziskane plasti ustrezajo predhodno opisanemu spodnjejurskemu zaporedju širšega območja, ki kaže postopno odpiranje iz hettangijskega medplimskega sedimentacijskega okolja v pliensbachijsko razgibano laguno. Pomemben element profila Staje so tudi neptunski dajki, ki do sedaj niso bili poznani v kamninah Dinarske karbonatne platfrome tega območja. Pojavljajo se v obliki razpok, zapolnjenih deloma s kalcitnim cementom, deloma pa s sedimentom tipa intra/bioklastični packstone, ki vsebuje zgornjejurske fosile. Le ti bi kot specifična značilnost lahko služili pri razločevanju artefaktov narejenih iz naravnega kamna pridobljenega iz območja Staj. 50 Boštjan ROŽIČ, Luka GALE, Rok BRAJKOVIĆ, Tomislav POPIT & Petra ŽVAB ROŽIČ Introduction The large alluvial fan of the Iška River at the southern outskirts of the Ljubljana Moor has been populated since pre-history (Velušček, 2004, 2010). During the first centuries AD the settlements from the Iška alluvial fan supplied the evolving colony of Emona (Šašel Kos, 2009) and left rich archaeological evidence, including numerous sepulchral monuments (roman tombstones) (Šašel, 1959; Ragolič, 2016; Veranič & Repanšek, 2016). At Marof near Ig, the archaeological site was discovered in the year 2014, which included a pit with stone monuments from the Roman period (Ragolič, 2016). The majority of these monuments are made of limestone, for which a local origin has been presumed (Žvab Rožič et al., 2016). Proof of Roman use of natural stone comes to us from depictions on stone monuments (stelae), which indicate that the Roman-era inhabitants of the Ig area were involved in quarrying, forestry, and metalworking (Šašel, 1959). Ramovš (in Šašel Kos, 1997) mentions four locations of possible quarries from the Roman period along the southern outskirts of the Ljubljana Moor: Sveta Ana, Podpeč, Staje and Skopačnik (listed moving from west to east). The only proven roman quarry is that known in the village of Podpeč (Ramovš, 2000; Djurić & Rižnar, 2017), because during the archaeological excavations by B. Djurić in 2017 remains of Roman-age architecture were found inside the quarry (Djurić, pers.comm.). In this locality grey, dark grey and almost black Pliensbachian limestone with abundant ooids and bioclasts is exposed (Buser & Debeljek, 1995; Gale, 2014, 2015; Kramar et al., 2015). However, as pointed out already by Žvab Rožič and co-workers (2016), facies of analysed artefacts from Marof differ from the Podpeč limestone. Nor does it correspond to the Lower Triassic limestone of the potential ancient quarry near the Skopačnik farm that was described by Mušič (1990). Until now, there was no detailed lithological data from the other two sites (Sveta Ana and Staje) of potential ancient quarries. This paper is the result of geological research of the Lower Jurassic succession from the village of Staje, i.e. the proposed site of the Roman quarry that was located closest to the above-mentioned Marof archeological site (cf. Ramovš in Šašel Kos, 1997). We provide a detailed sedimentologic and biostratigraphic description of the limestone succession from the Staje section from the site where the ancient quarry was most likely situated. This data will serve as the basis for comparison with stone artefacts recovered at Marof and other archaeological sites located close by. Geological setting The studied succession is located on the northern edge of the Krim-Mokrec Mountain Range and structurally belongs to the Hrušica Nappe of the External Dinarides (fig. 1) (Placer, 1999; 2008). The main structures of the area are NWSE oriented strike-slip faults (Buser et al., 1967; Buser, 1968). During the Mesozoic this area belonged to the northern part of the Dinaric (Adriatic) Carbonate Platform; thus, Upper Triassic to Middle Jurassic carbonates prevail (fig. 1). The Upper Triassic begins with a thin succession of coarse-crystalline (“cordevolian”) dolomite, part of which could be Middle Triassic in age (Celarc, 2004, 2008). It is followed by a thick peritidal Norian-Rhaetian Main Dolomite Formation. The Lower Jurassic part is dominated by micritic and bioclastic limestones that alternate with ooidal limestone. In the Pliensbachian part of this succession, lithiotid bivalves occur (Buser & Debeljak, 1995; Debeljak & Buser, 1997; Gale 2014, 2015), whereas the Toarcian part is marked by thin-bedded micritic limestone (Dozet, 2009). The Middle Jurassic is composed almost exclusively of ooidal limestone (Miler & Pavšič, 2008). Jurassic limestones are often replaced by dolomite (Buser et al., 1967, Buser, 1968; Miler & Pavšič, 2008). In addition to the described carbonates, Paleozoic clastics and Early Triassic carbonate-clastic succession outcrops to the east of the studied area (Buser, 1968; Mušič, 1990). To the north the described units are covered by Quaternary alluvial fan coarse-clastic sediments, which further north interfinger with lacustrine and marsh deposits (Buser et al., 1967, Buser, 1968). Methods The micro-location of the potential Roman quarry was determined using a combination of fieldwork observations and analysis of the digital elevation model based on detailed 1 × 1m Lidar data. In the selected area a detailed sedimentological section (almost 40 m at 1:50 scale) was logged and densely sampled. Logging included measurements of structural elements (orientation and dip of fractures, veins, neptunian dykes). A total of 58 samples were selected; from these, 62 thin-sections were made for microfacies and biostratigraphic analysis. Names of the sample correspond to the stratimetric position of the logged section (sample 7.1 was taken at the 7.1th m of the section). The size of the ooids and aggregate grains, and the number of ooid laminae were measured in at least 30 grains in each thin-section dominated by these grains. 51 Lower Jurassic succession at the site of potential Roman quarry Staje near Ig (central Slovenia) Micro-location of the potential Roman quarry The hilly area south of the village of Staje is composed of Lower Jurassic limestone and subordinate dolomite (fig. 2). This karstic terrain is dominated by dolines and passes into the relatively flat Iška River alluvial fan. On the transitional belt (including the area of Staje and other villages) between the hills and flatland, the gravel-sand sediments also cover geomorphological depressions within outcropping base-rock, such as valleys and larger dolines. Anthropogenic alFig. 1.a) Location of the studied section (boxed area is enlarged to the right). b) Macrotectonic subdivision of Slovenia (after Placer, 1999) with marked position of geological map below. c) Simplified geological map of the southern outskirts of the Ljubljana Moor (compiled from Buser et al., 1967 and Buser, 1968). The star marks the location of the studied section. 52 Boštjan ROŽIČ, Luka GALE, Rok BRAJKOVIĆ, Tomislav POPIT & Petra ŽVAB ROŽIČ Fig. 2. Geomorphological map of the area of Staje and Marof with marked positions of the logged section (potential roman quarry), “Stari dedec” Roman monument and Marof arheological site. 53 Lower Jurassic succession at the site of potential Roman quarry Staje near Ig (central Slovenia) terations of the bedrock can be recognized in the area of the villages of Staje and Ig, on the Pungrt hill, where the Ig Castle is situated, and at the SW flank of the flat valley that runs from the village of Staje in the SE direction (figs. 3a, b). The latter shows a straight escarpment, which is in stark contrast to the NE flank of the same valley, which is defined by soft karstic lines (some are probably dolines filled by gravel and sand deposits). The escarpment on the SW flank of valley is a subvertical rock-wall stretching up to 6 m in height. Fractu