Several Chittagong-based companies are among the largest industrial conglomerates and enterprises in Bangladesh. Once this receded, conglomerates, sandstones, and shales accumulated. This group contains sandstones, conglomerates, and volcanics. Lagos State houses headquarters of most conglomerates and commercial banks in Nigeria. Many of these businesses grew rapidly into the larger conglomerates. Almost all large local conglomerates have their corporate offices located in Dhaka. These rocks are often subdivided into conglomerates and breccias. Black took a controlling interest by outbidding two other conglomerates, Zapata Corporation and Textron. Tokio Marine is part of Mitsubishi, one of the few Japanese giant conglomerates (Keiretsu). The substratum is made of Pliocene deposits including sandstone, marl and various conglomerates. The limestones of Bermuda consist of biocalcarenites with minor conglomerates. Akij Group is the largest Bangladeshi industrial conglomerates. One of India's largest conglomerates, Tata Group is owned by Tata Sons. However, its strategy is consistent with that of other large, international financial conglomerates. Jamuna Group is one of the largest Bangladeshi industrial conglomerates.