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Ââåäåíèå Êàìåííîóãîëüíûå îòëîæåíèÿ øèðîêî ïðåäñòàâëåíû â áàññåéíå ð. Èëû÷, ãäå îíè âñêðûâàþòñÿ íà ïðîòÿæåíèè îêîëî 40 êì. Íà íåêîòîðûõ ó÷àñòêàõ ðåêè îáíàæàþòñÿ íåïðåðûâíûå ðàçðåçû îò ãîðèçîíòîâ äî öåëûõ îòäåëîâ êàìåííîóãîëüíîé ñèñòåìû. Íåñìîòðÿ íà ýòîò, êàçàëîñü áû, áëàãîïðèÿòíûé ôàêò, ñòðàòèãðàôèÿ êàðáîíà áàññåéíà ð. Èëû÷ ðàçðàáîòàíà åù ̧ äîâîëüíî ñëàáî, õîòÿ ýòîé ïðîáëåìå ïîñâÿùàëè ñâîè ðàáîòû Â. À. Âàðñàíîôüåâà, Ä. Ì. Ðàóçåð-×åðíîóñîâà, Ò. À. Äîáðîëþáîâà, Í. Â. Êàëàøíèêîâ, Ç. Ï. Ìèõàéëîâà, È. Ñ. Ìóðàâü ̧â è äð. Åñëè äëÿ ïîðîä âèçåéñêîãî ÿðóñà, îñîáåííî áîãàòûõ ôàóíîé, ìîæíî óæå â ïîëå âûäåëèòü õàðàêòåðíûå ôàöèè, ñòðàòèãðàôè÷åñêèå óðîâíè è îòñëåäèòü ïðèáëèçèòåëüíî èõ ãðàíèöû, òî äëÿ âûøåëåæàùèõ îòëîæåíèé ýòî ñäåëàòü çíà÷èòåëüíî òðóäíåå. Òàê, ñðåäíåêàìåííîóãîëüíûå îòëîæåíèÿ óäàëîñü ðàñ÷ëåíèòü òîëüêî íà îñíîâàíèè èçó÷åíèÿ ìèêðîôàóíèñòè÷åñêèõ êîìïëåêñîâ [2], à â ñòðàòèãðàôèè ñåðïóõîâñêîãî ÿðóñà áàññåéíà ð. Èëû÷ äî ñèõ ïîð èìåþòñÿ ïðîáëåìû. Îäíà èç òàêèõ ïðîáëåì ñâÿçàíà ñ îðãàíîãåííîé ïîñòðîéêîé, âñêðûòîé â ñðåäíåì òå÷åíèè ð. Èëû÷ ó óñòüÿ ñóõîãî ðó÷. Ïà÷à-Øîð (ðèñ. 1). Â. À. Âàðñàíîôüåâà [1] ñ÷èòàëà âîçðàñò ïîñòðîéêè ïîçäíåêàìåííîóãîëüíûì. Í. Â. Êàëàøíèêîâ [10] âíà÷àëå îòíîñèë å ̧ ê íèæíåáàøêèðñêîìó ïîäúÿðóñó ñðåäíåãî êàðáîíà, à ïîçäíåå – ê ïðîòâèíñêîìó ãîðèçîíòó ñåðïóõîâñêîãî ÿðóñà [11]. Íàìè îíà èçó÷àëàñü ïî ìåòîäèêàì, ðàçðàáîòàííûì ñïåöèàëüíî äëÿ èçó÷åíèÿ ðèôîãåííûõ îáðàçîâàíèé [3], âêëþ÷àþùèì â ñåáÿ îñíîâû ãåîëîãè÷åñêîãî êàðòèðîâàíèÿ. Öåëüþ èññëåäîâàíèé áûëî óñòàíîâëåíèå âîçðàñòà è ñòðîåíèÿ îðãàíîãåííîé ïîñòðîéêè, à òàêæå óòî÷íåíèå èñòîðèè îñàäêîîáðàçîâàíèÿ â áàññåéíå ð. Èëû÷ â ýòî âðåìÿ. Ôîòîãðàôèðîâàíèå ôîðàìèíèôåð è ñîñòàâëåíèå ôîòîòàáëèöû îñóùåñòâëÿëîñü ì. í. ñ. ß. À. Âåâåëü (ÈÃ Êîìè ÍÖ ÓðÎ ÐÀÍ, ã. Ñûêòûâêàð), êîòîðîé àâòîðû, ïîëüçóÿñü ñëó÷àåì, âûðàæàþò ñâîþ ãëóáîêóþ ïðèçíàòåëüíîñòü.

Lithology and stratigraphy of upper serpukhovian-lower baschkirian deposits at the Pacha-Shor section (Ilych river, Northern Urals)