Electronic Supplement to
Possible Earthquakes Recorded in Stalagmites from a Cave in South-Central Indiana

by Samuel V. Panno, Mirona I. Chirienco, Robert A. Bauer, Craig C. Lundstrom, Zhaofeng Zhang, and Keith C. Hackley

This electronic supplement contains photographs of in situ stalagmites DC 49A and DC 49B, DC 20 and DC 14, and photographs of locations of flood deposit samples DC 35, DC 36, and DC 37 from Donnehue’s Cave located in south-central Indiana.


Figures

Figure S1. Twin stalagmites DC 49A and DC 49B, immediately left of blue pencil, were no longer actively growing and are attached to a limestone shelf that has been undercut by stream action. These stalagmites do not have corresponding stalactites. The stalactite in the foreground, which appears to be over the twin stalagmites, is dripping on the side central portion of the speleothem that grew between the two stalagmites (photograph by S. V. Panno).

Figure S2. Stalagmite DC 20 helped create flowstone that rests on almost a meter of a fine-grained, clay-rich material. This stalagmite is no longer actively growing and has no corresponding stalactite. The stalagmite is growing on flowstone that overlies flood-deposited fine-grained material. No evidence of movement of the flowstone or the flood deposit was observed in the cave (photograph by S. V. Panno).

Figure S3. Stalagmite DC 14 grew among a field of actively growing stalagmites growing on flowstone covering a bedrock shelf located about 3 m above the base of the stream channel. The stalagmite on the far left is growing on bedrock. Stalagmite DC 14 is on the far right and is growing on bedrock that is partially covered by flowstone. Each of these stalagmites has a corresponding and relatively small stalactite, and each were actively growing at the time of sampling of DC 14 (photograph by S. V. Panno).

Figure S4. (a) Washout cavity within sediment in the floor of the upper passage showing stratified gravels within the deposit suggesting multiple flood events. The optically stimulated luminescence (OSL) age of sample DC 35, collected within the cavity wall, was 247,130 ± 14,120 yr B.P. (photograph by M. I. Chirienco). (b) Interior of washout cavity within sediment in the floor of the upper passage near the entrance. Sample DC 35 was collected from the fine-grained material to the left (photograph by M. I. Chirienco).

Figure S5. Remnant flood deposit on ledge above the upper passage floor. The OSL age of the sample DC 36, collected from the flood deposit, was 128,170 ± 7800 yr B.P. (photograph by M. I. Chirienco).

Figure S6. Remnant of flood deposit in lower passage showing stalagmite DC 20 in background. The OSL age of the sample DC 37, collected from the upper part of the flood deposit just beneath stalagmite DC 20, was 140,240 ± 9490 yr B.P. (photograph by M. I. Chirienco).

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