REFERENCES:
1. Bukanov V. V. Tsvetnye kamni i kollektsionnye mineraly. Entsiklopediya [Gem stones and collectible minerals. Encyclopedia], Saint-Petersburg, 2014, 464 p.
2. Gerasimov P. A., Mitta V. V., Kochanova M. D. Iskopaemye kelloveyskogo yarusa Tsentral'noy Rossii [Callovian fossil minerals in Central Russia], Moscow, VNIGNI. Mos. Gor. SYUN, 1996, 127 p.
3. Gulyaev D. B. Infrazonal ammonite scale in the Upper Bathonian–Lower Callovian in Central Russia. Stratigrafiya. Geologicheskaya korrelyatsiya. 2001. Vol. 9, no 1, pp. 68—96. [In Russ].
4. Naugol'nykh S. V. Paleontological finds in the Moscow Metro. Priroda. 2018, no 1, pp. 52—58. [In Russ].
5. Petrochenkov D. A. Semi-precious stone mineral reserves in the Ulyanovsk Region. Gornyy informatsionno-analiticheskiy byulleten'. 2006, no 5, pp. 319—323. [In Russ].
6. Petrochenkov D. A. Gemmologicheskie aspekty verkhnedevonskikh yuvelirno-podelochnykh ammonitov Marokko [Gemmology of the Upper Devonian jewelry- and ornamental-quality Morocco ammonite]. Doklady XII Mezhdunarodnoy nauchno-prakticheskoy konferentsii «Novye idei v naukakh o Zemle». Vol. I, Moscow, MGRI-RGRRU, 2015, pp. 321—322. [In Russ].
7. Petrochenkov D. A., Bykhovskiy L. Z. Jewelry-quality ammonites: Problems of appraisal and prospects of recovery. Mineral'nye resursy Rossii. Ekonomika i upravlenie. 2018, no 4, pp. 15—22. [In Russ].
8. Polyanin V. S., Polyanina T. A., Dusmanov E. N. Mineral and raw materials base of gem stones in Russia: Prospects of development and expansion. Razvedka i okhrana nedr. 2015, no 9, pp. 66—76. [In Russ].
9. Rogov M. A., Baraboshkin E. Yu., Guzhikov A. Yu. Granitsy yury i mela v Srednem Povolzh'e. Putevoditel' ekskursii «Mezhdunarodnaya nauchnaya konferentsiya po probleme granitsy yurskoy i melovoy sistemy» [Jurassic and Cretaceous boundaries in the middle Volga Region. Travel guide of the International Conference on the Jurassic and Cretaceous Boundary Problem], Samara, FGOBU Sam GTU, 2015, 130 p.
10. Bockwinkel J., Becker R. T., Ebbighausen V. Late Givetian ammonoids from Hassi Nebech (Tafilalt Basin, Anti-Atlas, southern Morocco). Fossil Record. 2013. Vol. 16(1). Рp. 5—65.
11. Kennedy W. J., Walaszczyk I., Gate A. S., Dembicz K., Praszkier T. Lower and Midle Cenomanian ammonites from Morondava Basin, Madagascar. Asta Geologica Polonica. 2013. Vol. 63(4). pp. 625—655.
12. Mychaluk K. Update on ammolite production from Southern Alberta, Canada. Gems & Gemology. 2009. Vol. 45, no 3 pp. 192—196.
13. Walaszczyk I., Kennedy W. J., Dembicz K., Gale A. S., Praszlier T., Rasoamiaramanana A. H., Randrianaly H. Ammonite and inoceramid biostratigraphy and biogeography of the Cenomanian through basal Middle Campanian (Upper Cretaceous) of the Morondava Basin, western Madagascar. Journal of African Earth Sciences, 2014, Vol. 89. pp. 79—132.
14. Zakharov Yu. D., Tanabe K., Shigeta Y., Safronov P. P., Smyshlyaeva O. P., Dril S. T. Early Albian marine environments in Madagascar: An integrated approach based on oxygen, carbon and strontium isotopic data. Cretaceous Research, 2016. Vol. 58. pp. 29—41.