Fig. 1
From: Patterns of the evolution of aptychi of Middle Jurassic to Early Cretaceous Boreal ammonites
Map showing aptychi-bearing sites, specimens from which are figured or discussed. 1 Kuhn Island, 2 Janusfjellet Mt, Vasstak Elva, Cape Festningen, 3 Sorkappland, 4 Kimmeridge Bay, 5 Eganovo, Rybaki, 6 Ivanovskoe, Glebovo, 7 Mikhalenino, 8 Hvadukassy, 9 Gorodischi, Ulianovsk, 10 Kashpir, Marievka, 11 Shirokij buerak, 12 Kelevudagh Mt, 13 Veselovskaya 5 well, 14 Nordvik, 15 Cape Hajryuzova