This is the contents of Bank 8 in a ROM map form.

Bank     :8
Contents :Metatile Definitions, Uncompressed Tiles
Range    :0x20000-24000

0x20000-0x2007F - ??

Collision Data (??)
0x20080-0x2087F - 0x100 per tileset

Metatile Definitions
0x20880-0x20A7F - Bubbles, Ruins 3 Catacombs
0x20A80-0x20C7F - Inside Ruins
0x20C80-0x20E7F - Final Ruins
0x20E80-0x2107F - Queen's Room
0x21080-0x2127F - First/Last Caves
0x21280-0x2147F - Outside/Ship
0x21480-0x21593 - Acid Caves (Acid Mid)
0x21594-0x218A7 - Acid Caves (Acid Down)
0x216A8-0x217BB - Acid Caves (Acid Up)
0x217BC-0x219BB - Outside Ruins

Graphics
0x219BC-0x21DBB - Alpha Metroids
0x21DBC-0x221BB - Beta Metroids
0x221BC-0x225BB - Zeta Metroids
0x225BC-0x229BB - Omega Metroids
0x229BC-0x231BB - Outside Ruins
0x231BC-0x239BB - Final Ruins
0x239BC-0x23EBB - Queeny's Head
0x23EBC-0x23EE9 - [ASM] Check if killed target number of Metroids
0x23EEA-0x23EF9 - Collision Pointer List
0x23EFA-0x23F19 - Solid block thresholds
0x23F1A-0x23F2D - Metatile Definition Pointer List
0x23F2E-0x23FFF - Free Space