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- Porter, M.L. and Engel, A.S. (2008) Diversity of
uncultured Epsilonproteobacteria from terrestrial sulfidic caves
and springs. Applied and Environmental Microbiology.
74(15):4973-4977. (link to abstract on
ASM website) (alignment
data file)
- Engel, A.S., and Bennett, P.C. (2008) Lower Kane Cave, Wyoming: Where
biology and geology meet, in Rhinehart, R. (ed)., National Speleological
Society Rocky Mountain Section Regional field guide, 43-57.
- Engel, A.S. and K.W. Randall (2008) Microbially enhanced carbonate
dissolution in karst aquifers, in Sasowsky, I.D., Feazel, C.T., Mylroie,
J.E., Palmer, A.N., and Palmer, M.V., Karst from Recent to Reservoirs,
Karst Waters Institute Special Publication 14, 52-56.
- Landrum, J.T., Bennett, P.C., Engel, A.S., Alsina, M., Pasten, P.,
Milliken, K. (Accepted) Partitioning geochemistry of arsenic and antimony,
El Tatio geyser field, Chile. Applied Geochemistry.
- Engel, A.S. (In review) Karst microbial ecosystems. Contribution to the
Encyclopedia of Geobiology. Springer Encyclopedia of Earth Science
Series (EESS).
- Porter, M.L., Engel, A.S., Kane, T.C., Kinkle, B.K.(In review)
Productivity-diversity relationships from chemolithoautotrophically
based sulfidic karst systems. International Journal
of Speleology.
-
Engel, A.S. (2007) On the biodiversity of sulfidic karst habitats.
Journal of Cave and Karst Studies. 69(1): 187-206. (Supplemental
Information: data table).
weblink (to download pdf)
- Engel, A.S., Lichtenberg, H., Prange, A., Hormes, J. (2007)
Speciation of sulfur from filamentous microbial mats from sulfidic cave springs
using X-ray absorption near edge spectroscopy. FEMS Microbiology Letters.
269(1): 54-62. (doi:10.1111/j.1574-6968.2006.00600.x).
weblink.
-
Meisinger, D.B.*, Zimmermann, J.*, Ludwig, L.,
Schleifer, K.-H., Wanner, G. Schmid, M. Bennett, P.C., Engel, A.S., Lee, N.M.
(2007 In situ
detection of novel Acidobacteria in
microbial mats from a chemolithoautotrophically-based cave ecosystem (Lower Kane
Cave, WY, USA). Environmental Microbiology. 9(6): 1523-1534. doi:10.1111/j.1462-2920.2007.01271.x
weblink.(* equal contribution) (See also journal June
cover photo, at right)
-
Campbell, B.J.*, Engel, A.S.*, Porter, M.L., and Takai, K. (2006) The versatile
Epsilonproteobacteria: Key players in sulphidic habitats. Nature
Reviews Microbiology. 4: 458-468.
Webpage link; pdf link
for paper; Supplementary Information
S1,
S2 (* equal
contribution)
- Phoenix,
V.R., Bennett, P.C., Engel, A.S., Tyler, S.W., and Ferris, F.G. (2006)
Chilean high-altitude hot spring sinters: a model system for UV screening
mechanisms by early Precambrian cyanobacteria. Geobiology.
4:15-28. pdf link
-
Engel, A.S. (2005) Chemoautotrophy, in Culver, D. and W. White, (eds.)
Encyclopedia of Caves. p. 90-102.
pdf
link (large file)
-
Bennett, P.C., and Engel, A.S. (2005) Microbial contributions to
karstification, in Gadd, G.M., Semple, K.T., and Lappin-Scott, H.M.
(eds.), Micro-organisms and Earth Systems - Advances in
Geomicrobiology. SGM Symposium 65, Cambridge
University Press: p. 3345-363.pdf
link (large file)
- Bennett,
P.C., Engel, A.S., Roberts, J.A. Counting and imaging bacteria on mineral
surfaces, in Clay Minerals Society Workshop Lectures. (IN PRESS).
-
Engel, A.S., Porter, M.L., Stern, L.A., Quinlan, S., Bennett, P.C. (2004) Bacterial diversity and ecosystem function of filamentous microbial mats
from aphotic (cave) sulfidic springs dominated by chemolithoautotrophic “Epsilonproteobacteria”.
FEMS Microbiology Ecology. 51:31-53.
pdf link
-
Engel, A.S., Stern, L.A., and Bennett, P.C. (2004) Microbial
contributions to cave formation: new insights into sulfuric acid speleogenesis. Geology. 32(5): 369-372.
pdf link
-
Engel, A.S., Lee, N., Porter, M.L., Stern, L.A., Bennett, P.C., and Wagner,
M. (2003) Filamentous “Epsilonproteobacteria” dominate microbial mats in
sulfidic caves. Applied and Environmental Microbiology. 69(9):
5503-5511. pdf link
- Stern,
L.A., Engel, A.S., Bennett, P.C., and Porter, M.L. (2002) Subaqueous and
subaerial speleogenesis in a sulfidic cave, in Martin, J.B., Wicks, C.M., and
Sasowsky, I.D. (eds.) Hydrogeology and Biology of Post- Paleozoic
Carbonate Aquifers. Karst Waters Institute Special
Publication 7. Gainesville, FL: p. 89-91.
-
Engel, A.S., Porter, M.L., Kinkle, B.K., and Kane, T.C. (2001) Ecological
assessment and geological significance of microbial communities from Cesspool
Cave, Virginia. Geomicrobiology Journal. 18:259-274.
pdf link
-
Engel, A.S., Bennett, P.C., and Stern, L.A. (2001) Biogeochemical diversity
of microbial mats from Lower Kane Cave, Wyoming, USA, in Weber, J., Jamroz, E.,
Drozd, J., and Karczewska, A. (eds.) Biogeochemical Processes and Cycling
of Elements in the Environment. 15th Int Symposium of
Environmental Biogeochemistry, Wroclaw, Poland: p. 135-136.
-
Vlasceanu, L., Sarbu, S., Engel, A.S., and Kinkle, B.K. (2000) Acidic,
cave-wall biofilms from the Frasassi Caves, Italy. Geomicrobiology Journal.
17:125-139. pdf link
-
Engel, A.S. (2000) Microbially-enhanced weathering in subsurface
environments: Sulfur-oxidizing bacteria and the cave environment, in Onac, B.
and Tamas, T. (eds.) Karst Studies and Problems: 2000 and Beyond.
Friends of Karst Special Meeting. Cluj, Romania: p. 130-134. web link
-
Summers Engel, A., Sarbu, S., Badescu, A., Lascu, C., Sasowsky, I., and
W. Huff. (1997) A study of cave sediment from Movile Cave, Southern Dobrogea,
Romania. Proceedings of the 12th International
Congress of Speleology Las Chaux-de-Fonds, Switzerland. Vol. 1: p.
25-28.
-
Krekeler, M.P.S., Summers Engel, A., Engel ,S., Mixon, D., and M.
Ragsdale. (1997) Sedimentology, clay mineralogy, and geochemistry of cave
sediment from Hard Baker Cave, Rockcastle County, Kentucky, USA. Proc. 12th
Int. Congress Speleology - Las Chaux-de-Fonds, Vol. 1: p. 21-24.
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- Engel, A.S., Meisinger, D.B., Porter, M.L., Lee,
N.M. (2008) Microbial mats in caves as model systems for the evolution of a
complex biosphere in a chemolithoautotrophic subsurface. International Kalkowsky-Symposium
"Geobiology of Stromatolites," University of Göttingen, Germany. October
4th-11th.
- Birdwell, J.E., Schulz, C., Engel, A.S. (2008)
Chromophoric dissolved organic carbon from cave and karst waters. International
Symposium for Subsurface Microbiology, Shizouka, Japan, November 16-21.
- Engel, A.S., Meisinger, D.B., Porter, M.L.,
Schmid, M., Lee, N.M. (2008) Caves as model systems for evolution of a complex
biosphere in a chemolithoautotrophic subsurface area. 8th Int. Workshop European
on Astrobiology EANA, Neuchâtel, Switzerland, Sept 1-3.
- Rossmassler, K., Engel, A.S., Campbell, B.J.,
Biogeography and phylogeny of Epsilonproteobacteria in sulfidic environments.
International Symposium for Subsurface Microbiology, Shizouka, Japan, November
16-21.
- Donnelly, B.M., Huber, K.G., Brannen, K.M.,
Bergeron, P.G., Mulec, J., Rossmassler, K., Campbell, B.J., and Engel, A.S.
(2008) Karst field school and research experience: undergraduate involvement in
the 16th International Karstological School and geomicrobiology research in
Slovenia. Houston, TX, Oct 5-9, Geological Society of America Abstracts with
program. (link)
- Engel, A.S., Birdwell, J.E., Johnson, L., Brannen,
K.M., Franks, M., Omelon, C.R., Landrum, J.T., Alsina, M.A., Pasten, P.A.,
Bennett, P.C. (2008) Biofilm development, microbial diversity, and dissolved
organic matter from El Tatio, Chile: implications for metalloid biogeochemical
cycling. (Invited oral presentation by P.J. Boston, Biofilms and
Biomineralization) Houston, TX, Oct. 5-9, Geological Society of America meeting
Abstracts with program. (link)
- Engel, A.S., Northup, D.E., Boston, P.J. (2008)
Role of microbes in hypogenic karst development and modification. Houston, TX,
Oct. 5-9, Geological Society of America meeting Abstracts with program. (link)
- Northup, D.E., Boston, P.J., Hughes, K., Clement,
A., Engel, A.S. (2008) Biofilm central: the wonderland of textures and bacterial
and archaeal communities in Cueva De Villa Luz. Houston, TX, Oct. 5-9,
Geological Society of America meeting Abstracts with program. (link)
- Engel, A.S.*, Beggio, M., Pamio, A., Dreon, A.L.,
Dorigo, L., Paoletti, M.G. Implications of bacterial diversity and activity in
carbonate deposits, Bus de la Foos Cave, Italy, in Zupan Hajan, N., and Mihevc,
A. 16th International Karstological School “Classical Karst”, Karst Sediments.
Karst Research Institute, Postojna, Slovenia, p. 69-70.
- Engel, A.S.* and K.W. Randall (2008) Microbially
enhanced carbonate dissolution in karst aquifers, “Karst from Recent to
Reservoirs” International Conference on Paleokarst & Multi-permeability Flow
Systems.” Rapid City, South Dakota (Invited oral presentation).
- N. Lee, D.B. Meisinger, M. Pavlekovic, H.J. Busse,
A. Summers Engel, G.M. Garrity, C.M. Henk, R. Rossello-Mora, K.-H. Schleifer, S.
Spring, B. Tindall, F.E. Löffler (2008) Biogeography, ecology, and phylogeny of
the Phylum Chloroflexi – isolation and description of novel taxa from different
environments. The 12th International Symposium on Microbial Ecology, Cairns,
Australia, August 17-22.
- Schulz, C., and Engel, A.S. (2007) Relating
microbial gene sequences to environmental factors: Cutting through the
trees. Geological Society of America meeting, Denver, CO, October.
- Green Garcia, A., Thiessen, M.,
Aronowsky, A., Anderson, L., and Engel, A.S. (2007)
Implications of bacterial diversity within a modern lucinid bivalve
habitat. Geological Society of America meeting, Denver, CO, October
(Poster presentation).
- Engel, A.S., Prange, A., Lichtenberg, H., Hormes,
J. (2007) Understanding natural sulfur biosignatures from sulfidic
spring microbial mats based on XANES spectroscopy, microbial diversity,
and stable isotope systematics. Geological Society of America meeting,
Denver, CO, October (Invited oral presentation).
- Birdwell, J., Schulz, C., and Engel, A.S. (2007) Microbially-derived carbon in
karst waters. National Speleological Society convention, Marengo, Indiana (oral
presentation).
- Engel, A.S., Porter, M.L., Campbell, B.J. (2007)
Karst as a model
system to examine
terrestrial microbial
biogeography patterns through time: An example from the Epsilonproteobacteria.
March, 2007, Time in Karst, Karst Waters Institute, Postojna, Slovenia.
- Schulz, C.J., Childers, G.W., Engel, A.S. (2006) Molecular investigations of
Bacteroides as microbial source tracking tools in southeast Louisiana
watersheds. American Geophysical Union meeting, San Francisco, CA (abstract
link).
- Reger, R., Porter, M.L., Menichetti, M., Engel, A.S. (2006) Diversity
comparisons between microbial mats and endosymbiont gut communities associated
with the cave-dwelling Androniscus dentiger (Isopoda: Oniscidae) from the
Frassasi Caves, Italy.
National
Speleological Society Convention. Convention Program Guide, Bellingham, WA, p.
100.
- Engel, A.S., Porter, M.L. (2006) Epsilonproteobacteria in terrestrial
cave and springs with sulfidic water.
National
Speleological Society. Convention Program Guide, Bellingham, WA, p. 100-101.
- Randall, K.W., and Engel, A.S. (2006) Microbially enhanced carbonate
dissolution in the Edwards Aquifer of Central Texas.
National
Speleological Society. Convention Program Guide, Bellingham, WA, p. 71-72.
- Engel, A.S., Lichtenberg, H., Prange, A., Hormes, J. (2006) Sulfur speciation
in naturally occurring filamentous microbial mats from sulfidic springs: A XANES
spectroscopy study. International Symposium on Microbial Sulfur Metabolism,
Münster, Germany.
- Engel, A.S., and Randall, K.W. (2006) Microbial
colonization and weathering of carbonates in deep subsurface settings. 19th
Annual Meeting of the International Mineralogical Association, Kobe, Japan.
(invited)
-
Meisinger, D.,
Lee, N., Engel, A.S., Bennett, P.C. (2005). Geomicrobiology: Caves as portals to
novel, chemoautotrophic ecosystems in the subsurface. Munich Environmental
Microbiology meeting, Germany. MEM_05, Program-Abstracts, p. 22.
(Meeting
abstracts link)
- Randall, K.W., Johnson, L., and Engel, A.S. (2005) Assessing the potential
impact of microbes in the Edwards and Trinity Aquifers of Central Texas. GSA
Abstracts with Program, Salt Lake City. Oct. 14-19.
(abstract link)
- Engel, A.S. and Porter, M.L. (2005) Exploring the microbial diversity of
sulfidic karst springs and evaluation of microbial indicator species. GSA
Abstracts with Program, Salt Lake City. Oct 14-19.
(abstract link)
- Armbrister, O.L., Jr., Engel, A.S., Ferrell, R.E. (2005) Geomicrobiology: An
essential teaching tool for GAEMP. GSA Abstracts with Program, Salt Lake City,
UT. Oct 15-19.
(abstract link) Green-Garcia, A. (made and presented poster at GSA)
- Lee, C., Anderson, L., Ellwood, B., Engel, A.S., Ferrell, R., Lambert, L., and
Lorenzo, J. (2005) An alternative to the traditional introductory geology
course: A GAEMP initiative for minority students. GSA Abstracts with Program,
Salt Lake City, Oc. 14-19.
(abstract link)
- Engel, A.S., Porter, M.L., and Northup, D. (2005) Transcontinental
distribution of novel "Epsilonproteobacteria" in terrestrial caves and springs
with sulfidic waters. Joint International Symposia for Subsurface Microbiology
(ISSM05) and Environmental Biogeochemistry (ISEB16), Jackson Hole, WY.
- Landrum, J., Engel, A.S., Milliken, K., Lansdown, J., Bennett, P.C. (2005)
Distribution of antimony in silica geyserite from El Tatio, Chile. Joint
International Symposia for Subsurface Microbiology (ISSM05) and Environmental
Biogeochemistry (ISEB16), Jackson Hole, WY.
- Meisinger, D., Engel, A.S., Lee, N., Porter, M.L., Stern, L.A., Bennett, P.C.
(2005) Molecular and functional diversity of anaerobic metabolic guilds in
aphotic redox-stratified microbial mats from Lower Kane Cave, Wyoming. Joint
International Symposia for Subsurface Microbiology (ISSM05) and Environmental
Biogeochemistry (ISEB16), Jackson Hole, WY.
- Zimmerman, J., Engel, A.S., Meisinger, D., Porter, M.L., Stern, L.A., Bennett,
P.C., Ludwig, W., Schliefer, K.-H., Lee, N. (2005) Acidobacterial diversity in
filamentous microbial mats from Lower Kane Cave, Wyoming. Joint International
Symposia for Subsurface Microbiology (ISSM05) and Environmental Biogeochemistry
(ISEB16), Jackson Hole, WY.
- Engel, A.S. (2004) “Epsilonproteobacteria” in microbial mats from
terrestrial caves and springs with sulfidic waters. 2nd
Okazaki Biology Conference on Terra Microbiology.
Ohmori, M., and Tiedje, J.M. (eds.), 24-25.
- Mabin, K., Engel, A.S., Stern, L.A.,
Bennett, P.C. (2004) Sulfur dynamics in a sulfidic cave system. GSA Abstracts
with Program Meeting, Denver, CO.
(abstract link)
- Bennett, P.C., Engel, A.S. Mabin, K., Stern,
L.A. (2004) Sulfur gas dynamics in a sulfidic cave aquatic system. Submitted
abstract to Goldschmidt Conference, Copenhagen, Denmark.
- Stern, L.A., Engel, A.S., Bennett, P.C.
(2003) Nitrogen isotope evidence of ammonia vapor assimilation by cave wall
microbial biofilms in a sulfidic cave, a novel mechanism of nutrient
acquisition. Eos Trans. AGU 84(46), Fall meeting Suppl, San Francisco,
CA, B42E-05.
(abstract link)
- Edwards, M.E., Bennett, P.C., Engel, A.S.
(2003) Geochemical and isotopic constraints on the source of groundwater to
Lower Kane Cave, Wyoming. Eos Trans. AGU 84(46), Fall meeting Suppl, San
Francisco, CA, H21D-0880.
(abstract link)
- Mabin, K., Bennett, P.C., Stern, L.A.,
Engel, A.S. (2003) Microbial influence on sulfur speciation in Lower Kane Cave,
WY. Eos Trans. AGU 84(46), Fall meeting Suppl, San Francisco, CA,
B51C-0973.
(abstract link)
- Engel, A.S., Stern, A., and Bennett, P.C.
(2003) The secret to sulfuric acid speleogenesis. GSA Abstracts with Program,
Seattle, WA.
(abstract link)
- Phoenix, V. R., Bennett, P.C., Engel, A. S.,
Tyler, S.W., and Ferris F.G. (2003) Chilean high-altitude hot spring sinters: a
model system for UV screening mechanisms by early Precambrian cyanobacteria.
GSA Abstracts with Program, Seattle, WA.
(abstract link)
- Engel, A.S., Stern, A., and Bennett, P.C.
(2003) Condensation on cave walls: Implications for cave enlargement and
sulfuric acid speleogenesis. Goldschmidt Conference, Kurishiki,
Japan. Geochimica et Cosmochimica Acta: p. A455.
- Engel, A.S., Bennett, P.C., Stern, L.A.
(2003) Volatile organosulfur gas production from aphotic (cave) sulfur-based
microbial communities. 16th International Symposium of
Environmental Biogeochemistry. Oirase, Aomori Prefecture, Japan: p.
184.
- Engel, A.S., Bennett, P.C., and Stern, L.A.
(2003) Consequences of low pH, cave-wall condensation and biofilm development to
sulfuric acid speleogenesis. National Speleological Society meeting Guidebook,
Porterville, CA: p. 8-95. (pdf link)
- Engel, A.S., Stern, L.A., and Bennett, P.C.
(2002) Sulfur cycling and nutrient spiraling in the terrestrial subsurface.
GSA Abstracts with Program, Denver, CO, p. 223.
- Bennett, P.C., Engel, A.S., and Rogers, J.R.
(2002) Microbes, microbial ecology, and the mineral surface. The Geological
Society William Smith Meeting-Life in Earth-Energy, Minerals, Mars and the
Deep Biosphere meeting. London, England.
- Engel, A.S., Bennett, P.C., Stern, L.A.,
Porter, M.L., Lee, N., and Wagner, M. (2002) Epsilon-Proteobacterial diversity
from sulfidic cave springs. International Symposium for Subsurface
Microbiology, Copenhagen, Denmark, p. 33-34.
- Stern, L.A., Engel, A.S., and Bennett, P.C.
(2002) In situ calcite dissolution by sulfur-oxidizing bacteria in a limestone
cave. Int. Symposium for Subsurface Microbiology, Copenhagen, Denmark, p.
34.
- Bennett, P.C., Engel, A.S., and Rogers, J.R.
(2002) Microbial ecology of mineral surfaces. International Mineralogical
Association. Edinburgh, Scotland. p. 171.
- Engel, A.S., Porter, M.L., Stern, L.A., and
Bennett, P.C. (2002) Diversity of chemoautotrophic sulfur-oxidizing bacteria in
sulfidic caves. Journal of Cave and Karst Studies, 64:180.
(pdf link)
- Porter, M.L., Russell, S., Engel, A.S., and
Stern, L.A. (2002) Population studies of the endemic snail Physa spelunca
(Gatropoda:Physidae) from Lower Kane Cave, WY. J. Cave Karst Studies,64:181.
(pdf link)
- Bennett, P.C., Engel A.S., and Stern, L.A.
(2002) Microbial processing of sulfur gases from a terrestrial cave ecosystem:
2nd Astrobiology Conference, NASA Ames Research Center, CA: p.
189.
- Engel, A.S., Bennett, P.C., and Stern, L.A.
(2001) Sulfuric acid speleogenesis: microbial karst and microbial crust. Eos
Trans. AGU 82(47), Fall meeting Suppl, San Francisco, CA, B22E-05.
- Stern, L.A., Bennett, P.C., and Engel, A.S.
(2001) Organic sulfur gas production in sulfidic caves. Eos Trans. AGU
82(47), Fall meeting Suppl, San Francisco, CA, B32C-08.
- Engel, A.S., Bennett, P.C., and Stern, L.A.
(2000) Mineralogic and geochemical consequences of microbial habitat
modification in sulfidic karst systems: Examples from the Kane Caves, Wyoming.
Eos Trans. AGU 81(48), Fall meeting Suppl, San Francisco, CA,
B71B-04.
- Engel, A.S. (2000) Geomicrobiology of
sulfidic karst systems. J. Cave and Karst Studies, 62:35.
- Engel, A.S., Porter, M., and Shapiro, V.
(2000) Ecological and geological significance of microbial communities in a
sulfidic cave. J. Cave and Karst Studies, 62:31-32.- Engel, A.S. (1999)Microbiological impacts on
the development of subsurface porosity in sulfidic karst systems. American
Association of Petroleum Geologists (AAPG) Bulletin, 83:1885.
- Engel, A.S. and B. Kinkle. (1999)
Chemoautotrophic bacteria and their role in development of sulfidic groundwater
systems. GSA Abstracts with Programs, Denver, CO: 31(7):935.
- Badescu, A., Sarbu, S., and Engel, A.S.
(1998) Preliminary geochemical investigations on the Mangalia aquifer(s),
Romania. GSA North-Central Section Abstracts with Programs, Columbus, OH:
30(2):3.
- Krekeler, M.P.S., Grover, J., Potter, P.,
and Engel, A.S. (1998) Dissolutional features associated with a small thrust
fault, Maysville, Mason County, Kentucky: a study to connect regional structural
and geomorphic histories. GSA Southeastern Section Abstracts, Charleston,
WV: 30(4):22.
- Engel, A.S. (1997) Microorganisms and
condensation corrosion: a discussion of dolomite, its occurrence in caves, and
possible microbial mediation. National
Speleological Society
Convention Guidebook, Sullivan, MO: p. 60-61.
- Engel, A.S. and S. Engel.
(1997) The forgotten karst of northeastern Kentucky: a case study of
regional speleogenesis in Carter Caves State Resort Park.
NSS Guidebook, Sullivan,
MO: p. 62.
- Mixon, D., Morton, C., Ragsdale, M., Helfin,
D., Krekeler, M.P.S., and Engel, A.S. (1997) Characteristics of clastic cave
sediment from Great Saltpetre Cave, Rockcastle County, Kentucky. The
Ohio Journal of Science, 97(2):20.
- Engel, A.S. and Lascu, C. (1996) Clays from
Movile Cave, Southern Dobrogea, Romania: speleohistoric indicators of cavern
formation. Clays and Clay Minerals Society Annual Meeting, Programs and
Abstracts. Gatlinburg, TN: p. 53.
- Engel, A.S. (1996) Scanning electron
microscopy of fine-grained sediment from Movile Cave, Southern Dobrogea,
Romania. NSS Annual Meeting Guidebook, Salida, CO: p. 44.
- Engel, A.S., Huff, W., Badescu, A., Lascu,
C., and S. Sarbu (1996) Sediment studies from Movile Cave, South Dobrogea,
Romania. GSA Abstracts with Programs, Denver, CO: p. 281.
- Mixon, D., Ragsdale, M., Engel, A.S.,
Krekeler, M.P.S., Mickler, P., and S. Engel (1996) Clay mineralogy of some
clastic cave deposits from Great Saltpetre Cave, Kentucky: detrital and
authigenic minerals. Geological Society of America Abstracts with Programs,
Denver, CO: p. 307.
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