CA,Saline Valley,36.70166,-117.81597,3860
NV,Humboldt Salt Marsh,39.82667,-117.98556,1420
UT,Pine Valley Hardpan,38.620789,-113.7027535,805
AK,Korovin Volcano,52.37974,-174.15545,800
OR,Summer Lake,42.83,-120.75,600.5
TX,Salt Basin,31.39999,-104.83086,596
HI,Puhimau Crater,19.39302,-155.24879,520
AZ,Meteor Crater,35.02799,-111.02311,497
NM,Laguna del Perro,34.56996,-105.96283,300
WV,1 mile west of Alta,37.86838,-80.56399,280
TN,Big Sink,36.03963,-85.38797,263
ID,Crater Butte,42.956,-114.276,258
WA,Omak Lake,48.25180,-119.36388,250
CO,Dotsero Crater,39.65961,-107.03512,242
KY,1 m. w. Violet City,37.16415,-86.11359,180
MT,2 miles ENE Moran Lake,48.96678,-115.06445,180
WY,Separation Lake,41.9899577,-107.2553321,160
VA,Sinking Creek,36.84051,-82.42433,140
AL,Fricks Cove,34.50555,-86.0818,140
MO,Forty Acre Sinkhole,37.1664378,-91.5331958,140
FL,Devils Mill Hopper,29.70710,-82.39429,120
WI,1/2 mile WSW of Rib Lake,46.66631,-91.2294,110
MI,3/4 mi. SW of Second Lake,44.81929,-84.16849,100
MN,in 6-60N-21W,47.70670,-93.04892,90
MA,one of 3,41.6718,-70.5871,100
NY,2 miles north of Twin Ponds,40.93135,-72.96325,70
NE,Big Swede Valley,41.89713,-101.95338,60
NH01,The Hoppers 2 areas,43.22222,-70.95091,60
NH02,The Hoppers 2 areas,43.22413,-70.95610,60
ND,3/4 m. E Smoky Butte,48.67883,-103.54649,60
ME,1000' NE of Myers Ponds,44.67715,-67.8345,55
KS,Little Basin,37.23858,-99.9826,50
SD,Bradley St. Pub. Shoot. Ar.,45.07461,-97.62314,50
IN,.3 mi. west of Hamer Cave,38.73239,-86.4312,50
IL,.4 mi. west of New Hanover,38.38496,-90.23382,50
CT,.5 mile S. of Mustard Bowl,41.63145,-72.63544,50
AR,big area .8 mi. E. co. line,35.99228,-92.29378,40
VT,3/4 mi. NNE Lake Shaftsbury,43.02987,-73.17513,40
PA,The Sink,41.16925,-76.96079,40
NJ,3/4 mi. SW of Swartswood St.,41.06521,-74.80192,40
OK,27-1N-4E,36.52095,-102.61608,33
NC,3/4 mile east of Mann Point,35.97648,-75.65482,30
GA,3/4 mi. E. of St. Marks Ch.,31.11597,-84.47199,30
OH,1 mile SE of Castalia,41.38921,-82.79662,25
MD,small hole on Martin Mtn.,39.69728,-78.63138,20
IA,Maquoketa Caves State Park,42.12151,-90.77509,20
RI01,2 areas in Rodman Hollow,41.15694,-71.5867,20
RI02,2 areas in Rodman Hollow,41.15546,-71.58653,20
SC,3 miles north of Barnwell,33.27350,-81.34706,20
LA01,2 nearby ponds,32.59596,-91.06758,15
LA02,2 nearby ponds,32.59656,-91.06936,15
MS,3/4 mile SW of Longwood,33.14025,-91.07876,10
DE,1 / 4 mi.SE Ebenezer Cem.,38.72690,-75.15168,10