Madison interval M-1 to M-3 12 Structural-thickness relations 12 Structural rock-type relations 12 Madison interval M-3 to M-7. .. 13 CONTENTS Map showing rock types of the Red River Formation or equivalent rocks (Upper Ordovician) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing thickness of Interlake Formation (uppermost Ordovician and Silurian) in parts of Montana, North Dakota, and South Dakota. Map showing rock types of the Interlake Formation (uppermost Ordovician and Silurian) in parts of Montana, North Dakota, and South Dakota. Map showing thickness of Middle and Upper Devonian rocks in parts of Montana, North Dakota, South Dakota, and Wyoming. Map showing thickness of the Madison Limestone and equivalent rocks (Lower and Upper Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing rock types of the Madison Limestone and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing thickness of the Madison Limestone interval M-1 to M-3 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, and Wyoming. Map showing rock types of the Madison Limestone interval M-1 to M-3 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, and Wyoming. Map showing thickness of the Madison Limestone interval M-3 to M-7 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing rock types of the Madison Limestone interval M-3 to M-7 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing thickness of the Madison Limestone interval M-7 to M-8.5 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing rock types of the Madison Limestone interval M-7 to M-8.5 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska Map showing thickness of the Madison Limestone interval M-8.5 to M-12 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing rock types of the Madison Limestone interval M-8.5 to M-12 and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, Wyoming, and Nebraska. Map showing thickness of the Madison Limestone interval M-12 to Me and equivalent rocks (Mississippian) in parts of Montana, North Dakota, South Dakota, and Wyoming. Map showing rock types of the Madison Limestone interval M-12 to Me and equivalent rocks (Misssissippian) in parts
