This paper presents a detailed study of the Tuvalian clastic member in the Lesno Brdo Area in Central Slovenia (External Dinarides). The member represents the uppermost part of the mixed siliciclastic -carbonate Carnian succesion that overlays the carstified emersion surface on top of the "Cordevolian" limestone and dolomite. The Tuvalian member is composed of red and violet sandy mudstone and marlstone that are interbedded with sandstone and gravelly sandstone. Calcite concretions are common, particularly in mudstone and marlstone. The succession was deposited on the flood plain, where fine-grained flood sediments are interrupted by mediumto coarse-grained crevasse splay sandstone and cross-stratified gravely sandstone of the small river channels. Alternatively, this succession could have been deposited in the distal zone -terminal splay/fan sediments. According to paleogeographic subdivison we suggest that the provenance area was located to the south, where carbonates, volcanoclastites/vulcanites as well as clastites were eroded. IzvlečekV pričujočem članku je opisana litološka sestava t.i. tuvalskega klastičnega člena iz okolice Lesnega Brda v osrednji Sloveniji. Člen predstavlja zgornji del paketa karnijskih karbonatnih in klastičnih kamnin, ki prekrivajo kraško-erozijsko diskordanco na vrhu »cordevolskega« apnenca in dolomita. Tuvalski klastični člen sestavljajo rdeči do vijoličasti rahlo peščeni muljevci, oziroma laporovci, z vmesnimi plastmi apnenčevih polilitičnih peščenjakov in prodnatih peščenjakov. Predvsem drobnozrnati različki kamnin vsebujejo kalcitne konkrecije. Zaporedje je bilo odloženo na poplavni ravnici, kjer prevladujoče drobnozrnate poplavne sedimente prekinjajo vmesne plasti srednje do debelozrnatih peščenjakov prebojnih pahljač in navzkrižno laminiranih prodnatih peščenjakov manjših rečnih korit. Alternativno bi se to zaporedje lahko odložilo na območju zaključnih vršajev. Glede na takratno paleogeografijo sklepamo, da je bilo izvorno območje sedimenta na jugu, kjer so bile razgaljene in erodirane predvsem karbonatne, vulkanoklastične in tudi klastične kamnine.
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