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Lithologic and textural characteristics of the cleaned basalt drill cuttings were used to identify intraflow structures (e.g., flow top, dense interior, flow bottom, pillow complex, etc.). Accuracy in determining the depth of flow contacts and thicknesses of intraflow structures is usually limited by sampling interval.Basalt (US: / b ə ˈ s ɔː l t, ˈ b eɪ s ɒ l t /, UK: / ˈ b æ s ɔː l t, ˈ b æ s əl t /) is a mafic extrusive igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. More than 90% of all volcanic rock on Earth is basalt. Basalt lava has a low viscosity, due to its low silica content .