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Introduction ______________________________ 1 Stratigraphy-_______________________ 2 Sinter________________________________________ 2 Obsidian-rich sediments _________________ 3 Biscuit Basin flow ____________________________ 5 Flow breccia_________________________ 5 Pumiceous tuff ___________________________ 6 Hydrothermal alteration ____________________ 6 Y-7 drill hole __________________________________________ 6 Sinter_______________________________ 6 Obsidian-rich sediments ________________ 6 Flow breccia of the Biscuit Basin flow___________ 12 Y-8 drill hole _________________________________ 13 Sinter____________________________ 13 Page Hydrothermal alteration Continued Y-8 drill hole Continued Obsidian-rich sediments __________-__ _. _-___A13 Flow breccia of the Biscuit Basin flow _____________ Pumiceous tuff of the Biscuit Basin flow___ _________ Significance of minerals and mineral assemblages. ________ Obsidian __________________________________ Clay minerals ____________________.. ________ Silica minerals _____________________________ Zeolites ________________________________ Potassium feldspar______________________________ Calcite _____________________________ Relative importance of temperature and fluid compositions _-Summary of evidence for self-sealing _________________ References cited __________________________________ __

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The tube-fed pā hoehoe lava flows covering much of the northeast flank of Kīlauea Volcano are named the 'Ailā'au flows. Their eruption age, based on published and six new radiocarbon dates, is approximately AD 1445. The flows have distinctive paleomagnetic directions with steep inclinations (407-507) and easterly declinations (07-107E