{"text_format":"3","workbook":"xlsx","n_sheets":1,"sheets":["Sheet1"],"read":"whole","date_system":"1900"}

{"sheet":"Sheet1","index":0,"n_rows":36,"n_cols":20,"rows_kept":36}
["Table S1. U-Th results."]
[]
["Sample ID","Description","238U","± (2σ)","232Th","± (2σ)","δ234U","± (2σ)","(230Th/238U)","± (2σ)","230Th/232Th","± (2σ)","Age (yr)","± (2σ)","Age (yr)","± (2σ)","δ234U initial","± (2σ)","Age (yr BP)","± (2σ)"]
[null,"mm from top","(ng/g)a",null,"(pg/g)a",null,"(per mil)b",null,"activity",null,"ppm atomic",null,"(uncorrected)c",null,"(corrected)d",null,"(per mil)e",null,"(corrected)f"]
["WE-13",1.64,{"v":5873.623299960185,"d":"5874"},{"v":117.47687982047358,"d":"117"},{"v":5818.710728806737,"d":"5819"},{"v":117.29153487951211,"d":"117"},397,{"v":2.1377462593957146,"d":"2.1"},{"v":0.005162411619438845,"d":"0.0052"},{"v":1.0119300047656553E-4,"d":"0.0001"},{"v":82.73891786221508,"d":"83"},{"v":1.627087354916777,"d":"2"},{"v":403.482236012903,"d":"403"},{"v":7.94688848441952,"d":"8"},{"v":382.066175683894,"d":"382"},{"v":13.3342460065597,"d":"13"},{"v":397.86675418805,"d":"398"},{"v":2.14035882909835,"d":"2"},{"v":313.8,"d":"314"},{"v":13.3,"d":"13"}]
["WE-5",14.96,{"v":5143.765388806986,"d":"5144"},{"v":102.88357579533017,"d":"103"},{"v":5807.561813795433,"d":"5808"},{"v":116.96382058578881,"d":"117"},{"v":387.2420687733391,"d":"387.2"},{"v":1.9204559580057734,"d":"1.9"},{"v":0.01734716626036999,"d":"0.0173"},{"v":1.0487733595303496E-4,"d":"0.0001"},{"v":243.94601942762685,"d":"244"},{"v":1.5151242504352722,"d":"2"},{"v":1371.42471443087,"d":"1371"},{"v":8.5557876223929,"d":"9"},{"v":1346.85425176499,"d":"1347"},{"v":14.9679310652084,"d":"15"},{"v":388.716670241202,"d":"388.7"},{"v":1.9273815639118,"d":"1.9"},{"v":1279.4,"d":"1279"},15]
["WE-16",20,{"v":4742.788996815294,"d":"4743"},{"v":94.85581338557178,"d":"95"},{"v":6063.366587251476,"d":"6063"},{"v":140.94130490586218,"d":"141"},{"v":380.4961637836637,"d":"380.5"},{"v":2.0023218987600115,"d":"2.0"},{"v":0.030756091219999566,"d":"0.0308"},{"v":2.8795806554789691E-4,"d":"0.0003"},{"v":381.96977769185935,"d":"382"},{"v":5.722414469482982,"d":"6"},{"v":2454.51448787668,"d":"2455"},{"v":23.497469354767,"d":"23"},{"v":2426.58138456532,"d":"2427"},{"v":27.330972123975,"d":"27"},{"v":383.110562717705,"d":"383.1"},{"v":2.01597324013824,"d":"2.0"},{"v":2357.8,"d":"2358"},{"v":27.3,"d":"27"}]
["WE-17",27.4,{"v":7308.897266791296,"d":"7309"},{"v":146.1783652610783,"d":"146"},{"v":1506.2245308376964,"d":"1506"},{"v":70.72909187030835,"d":"71"},{"v":374.8253959111227,"d":"374.8"},{"v":1.6760600631379643,"d":"1.7"},{"v":0.03415092494274646,"d":"0.0342"},{"v":2.5173511620287225E-4,"d":"0.0003"},{"v":2631.1311478980133,"d":"2631"},{"v":113.34725942263354,"d":"113"},{"v":2739.99724919523,"d":"2740"},{"v":20.710806450216,"d":"21"},{"v":2735.47693109539,"d":"2735"},{"v":20.832943332929,"d":"21"},{"v":377.729726420616,"d":"377.7"},{"v":1.68913424527712,"d":"1.7"},{"v":2666.7,"d":"2667"},{"v":20.8,"d":"21"}]
["WE-18",30,{"v":2775.2644936052448,"d":"2775"},{"v":55.50679323521794,"d":"56"},{"v":48920.6196902343,"d":"48921"},{"v":982.9665852104798,"d":"983"},{"v":337.50184636636703,"d":"337.5"},{"v":2.372723432283603,"d":"2.4"},{"v":0.048447079165933944,"d":"0.0484"},{"v":6.6494921235678826E-4,"d":"0.0007"},{"v":43.63730416022334,"d":"44"},{"v":0.599054662127729,"d":"1"},{"v":4017.30226707466,"d":"4017"},{"v":56.5563436117317,"d":"57"},{"v":3619.05581515831,"d":"3619"},{"v":207.357818088633,"d":"207"},{"v":340.966635324953,"d":"341.0"},{"v":2.40565116098894,"d":"2.4"},{"v":3549.5,"d":"3550"},{"v":207.4,"d":"207"}]
["WE-14",33,{"v":5641.025145919668,"d":"5641"},{"v":112.8436783165105,"d":"113"},{"v":2750.6485196228605,"d":"2751"},{"v":58.6889682201585,"d":"59"},{"v":323.88116447891656,"d":"323.9"},{"v":3.981453390085635,"d":"4.0"},{"v":0.05213922321490262,"d":"0.0521"},{"v":2.3803626543588983E-4,"d":"0.0002"},{"v":1697.7173112334422,"d":"1698"},{"v":14.258138593103084,"d":"14"},{"v":4374.70311779919,"d":"4375"},{"v":24.3990239493847,"d":"24"},{"v":4363.60594516148,"d":"4364"},{"v":25.0041167048988,"d":"25"},{"v":327.894044839023,"d":"327.9"},{"v":4.0303929620988,"d":"4.0"},{"v":4295.2,"d":"4295"},25]
["WE-6",54.82,{"v":8479.926726560376,"d":"8480"},{"v":169.6450438186499,"d":"170"},{"v":8435.267925957727,"d":"8435"},{"v":169.71778130340098,"d":"170"},{"v":290.1022787362699,"d":"290.1"},{"v":2.831453856345815,"d":"2.8"},{"v":0.06000709805772382,"d":"0.0600"},{"v":2.1144877690123796E-4,"d":"0.0002"},{"v":957.7975616987227,"d":"958"},{"v":3.4026252260372187,"d":"3"},{"v":5185.09395831306,"d":"5185"},{"v":22.0422084012856,"d":"22"},{"v":5161.86797529271,"d":"5162"},{"v":24.8910062771386,"d":"25"},{"v":294.358875063602,"d":"294.4"},{"v":2.8726157160747,"d":"2.9"},{"v":5093.5,"d":"5094"},{"v":24.9,"d":"25"}]
["WE-15",73.5,{"v":11248.561439403302,"d":"11249"},{"v":225.15216076137725,"d":"225"},{"v":1090.5973776053083,"d":"1091"},{"v":27.67797136492395,"d":"28"},{"v":298.1256537964372,"d":"298.1"},{"v":3.874092402556739,"d":"3.9"},{"v":0.062431324049834785,"d":"0.0624"},{"v":2.3094435226778847E-4,"d":"0.0002"},{"v":10223.814602613482,"d":"10224"},{"v":162.46029079833994,"d":"162"},{"v":5365.09582046191,"d":"5365"},{"v":26.1510124730333,"d":"26"},{"v":5362.84672874533,"d":"5363"},{"v":26.1709449218251,"d":"26"},{"v":302.672236160129,"d":"302.7"},{"v":3.93313961981455,"d":"3.9"},{"v":5294.5,"d":"5295"},{"v":26.2,"d":"26"}]
["WE-7",87.56,{"v":5216.697243543019,"d":"5217"},{"v":104.33471131868195,"d":"104"},{"v":6561.0917567731185,"d":"6561"},{"v":132.0510578133033,"d":"132"},{"v":311.64720170556205,"d":"311.6"},{"v":1.851064804051828,"d":"1.9"},{"v":0.06924306040724959,"d":"0.0692"},{"v":3.1368120040871182E-4,"d":"0.0003"},{"v":874.1252391449316,"d":"874"},{"v":4.096276954195136,"d":"4"},{"v":5902.14246030065,"d":"5902"},{"v":28.734759655249,"d":"29"},{"v":5873.27732076626,"d":"5873"},{"v":32.1460654286875,"d":"32"},{"v":316.855513951405,"d":"316.9"},{"v":1.88215502949675,"d":"1.9"},5805,{"v":32.1,"d":"32"}]
["WE-4",103.8,{"v":7791.016799119757,"d":"7791"},{"v":156.16094858185403,"d":"156"},{"v":2383.3472462965124,"d":"2383"},{"v":47.97646039263567,"d":"48"},{"v":355.3800991034941,"d":"355.4"},{"v":2.0623410248962983,"d":"2.1"},{"v":0.08372947030080155,"d":"0.0837"},{"v":2.5465899530216116E-4,"d":"0.0003"},{"v":4345.73306423732,"d":"4346"},{"v":13.982479586745413,"d":"14"},{"v":6935.04923961054,"d":"6935"},{"v":24.3218016003782,"d":"24"},{"v":6928.26371105231,"d":"6928"},{"v":24.5527713752382,"d":"25"},{"v":362.396753358657,"d":"362.4"},{"v":2.10286281709207,"d":"2.1"},{"v":6860.8,"d":"6861"},{"v":24.6,"d":"25"}]
["WE-8",133.15,{"v":10272.267728728231,"d":"10272"},{"v":205.4641764226669,"d":"205"},{"v":3639.8163435938695,"d":"3640"},{"v":74.97015920901515,"d":"75"},{"v":404.24771350808487,"d":"404.2"},{"v":1.7413411319223466,"d":"1.7"},{"v":0.10054010989167629,"d":"0.1005"},{"v":4.0421102384770606E-4,"d":"0.0004"},{"v":4505.096509429257,"d":"4505"},{"v":27.174499103472968,"d":"27"},{"v":8073.54245644055,"d":"8074"},{"v":35.16278830946,"d":"35"},{"v":8065.9672566947,"d":"8066"},{"v":35.3636108261153,"d":"35"},{"v":413.555280417926,"d":"413.6"},{"v":1.78156239070628,"d":"1.8"},{"v":7997.7,"d":"7998"},{"v":35.4,"d":"35"}]
["WE-19",151,{"v":8227.635438294838,"d":"8228"},{"v":164.5844005612238,"d":"165"},{"v":3833.9951988080106,"d":"3834"},{"v":77.31558583022085,"d":"77"},{"v":398.24504987427844,"d":"398.2"},{"v":2.20356070054958,"d":"2.2"},{"v":0.10146596047056089,"d":"0.1015"},{"v":3.7645401814410652E-4,"d":"0.0004"},{"v":3457.1779175009938,"d":"3457"},{"v":14.141436743302597,"d":"14"},{"v":8187.00249742031,"d":"8187"},{"v":34.2006479738247,"d":"34"},{"v":8176.99762365764,"d":"8177"},{"v":34.5586281455011,"d":"35"},{"v":407.541746037373,"d":"407.5"},{"v":2.25580100919965,"d":"2.3"},{"v":8107.5,"d":"8108"},{"v":34.6,"d":"35"}]
["WE-20",170,{"v":7282.201010188147,"d":"7282"},{"v":145.766284186644,"d":"146"},{"v":15578.261754295012,"d":"15578"},{"v":312.2435319908261,"d":"312"},{"v":405.58907740464514,"d":"405.6"},{"v":2.531452132318688,"d":"2.5"},{"v":0.10557158346304597,"d":"0.1056"},{"v":3.5310470640095978E-4,"d":"0.0004"},{"v":783.5533747955866,"d":"784"},{"v":2.329525380621647,"d":"2"},{"v":8483.81548115308,"d":"8484"},{"v":33.4582836798326,"d":"33"},{"v":8438.13237657379,"d":"8438"},{"v":40.4827314423068,"d":"40"},{"v":415.363170609741,"d":"415.4"},{"v":2.59242819097807,"d":"2.6"},{"v":8368.6,"d":"8369"},{"v":40.5,"d":"41"}]
["WE-9",189.68,{"v":7070.73694758064,"d":"7071"},{"v":141.42771540437678,"d":"141"},{"v":8396.705319912573,"d":"8397"},{"v":169.30767168657795,"d":"169"},{"v":404.242069553715,"d":"404.2"},{"v":2.538624836797029,"d":"2.5"},{"v":0.10618573231583239,"d":"0.1062"},{"v":4.2654648079631572E-4,"d":"0.0004"},{"v":1419.7105812156374,"d":"1420"},{"v":6.0964306422524945,"d":"6"},{"v":8543.51496879276,"d":"8544"},{"v":39.0665670167002,"d":"39"},{"v":8518.13434661361,"d":"8518"},{"v":41.0589809428179,"d":"41"},{"v":414.07718545358,"d":"414.1"},{"v":2.60121628408362,"d":"2.6"},{"v":8449.8,"d":"8450"},{"v":41.1,"d":"41"}]
["WE-21",205,{"v":8999.37544283819,"d":"8999"},{"v":180.30682512199195,"d":"180"},{"v":650.7677638484643,"d":"651"},{"v":14.743117730885242,"d":"15"},{"v":404.07833285616744,"d":"404.1"},{"v":2.4589452003470575,"d":"2.5"},{"v":0.11572176398778633,"d":"0.1157"},{"v":3.985493661469146E-4,"d":"0.0004"},{"v":25408.514091550413,"d":"25409"},{"v":279.44343612088295,"d":"279"},{"v":9342.58378516985,"d":"9343"},{"v":37.6143601103933,"d":"38"},{"v":9341.0393386925,"d":"9341"},{"v":37.6210762845637,"d":"38"},{"v":414.871528368991,"d":"414.9"},{"v":2.52506778745319,"d":"2.5"},{"v":9271.5,"d":"9272"},{"v":37.6,"d":"38"}]
["WE-22",222,{"v":9092.419030885667,"d":"9092"},{"v":182.40282903775963,"d":"182"},{"v":1568.2028412692143,"d":"1568"},{"v":32.248580265480015,"d":"32"},{"v":405.1966886391496,"d":"405.2"},{"v":3.0483795059208414,"d":"3.0"},{"v":0.11650717211360848,"d":"0.1165"},{"v":3.7752364770358673E-4,"d":"0.0004"},{"v":10725.2580760947,"d":"10725"},{"v":57.33150424886843,"d":"57"},{"v":9400.64728540151,"d":"9401"},{"v":38.2432544070146,"d":"38"},{"v":9396.96668815886,"d":"9397"},{"v":38.2830767147159,"d":"38"},{"v":416.086084358632,"d":"416.1"},{"v":3.13023341283865,"d":"3.1"},{"v":9327.4,"d":"9327"},{"v":38.3,"d":"38"}]
["WE-10",237.72,{"v":10048.59023106363,"d":"10049"},{"v":200.97307956877,"d":"201"},{"v":6698.762239283707,"d":"6699"},{"v":135.507455043201,"d":"136"},{"v":404.63490964186553,"d":"404.6"},{"v":1.6584740855743478,"d":"1.7"},{"v":0.11677226424362414,"d":"0.1168"},{"v":4.2554487018478353E-4,"d":"0.0004"},{"v":2781.1739863791327,"d":"2781"},{"v":12.100304545023343,"d":"12"},{"v":9426.85195382232,"d":"9427"},{"v":37.6028106090871,"d":"38"},{"v":9412.6195775478,"d":"9413"},{"v":38.2655487942171,"d":"38"},{"v":415.527336266976,"d":"415.5"},{"v":1.70322277989726,"d":"1.7"},{"v":9344.3,"d":"9344"},{"v":38.3,"d":"38"}]
["WE-3",245.13,{"v":9099.280756015165,"d":"9099"},{"v":182.07685056185994,"d":"182"},{"v":21295.394470469924,"d":"21295"},{"v":438.17202506477685,"d":"438"},{"v":404.0208096778155,"d":"404.0"},{"v":1.5172164103007695,"d":"1.5"},{"v":0.1178059892313464,"d":"0.1178"},{"v":6.9189433267194693E-4,"d":"0.0007"},{"v":799.2205287683121,"d":"799"},{"v":5.883741441749695,"d":"6"},{"v":9518.10024451622,"d":"9518"},{"v":59.1767509173021,"d":"59"},{"v":9468.10765462106,"d":"9468"},{"v":64.2348659452135,"d":"64"},{"v":414.961782112995,"d":"415.0"},{"v":1.55989487820206,"d":"1.6"},{"v":9400.6,"d":"9401"},{"v":64.2,"d":"64"}]
["Hiatus"]
["WE-2",249.32,{"v":5893.148460476719,"d":"5893"},{"v":117.88857896483584,"d":"118"},{"v":54395.39608751733,"d":"54395"},{"v":1100.566182551769,"d":"1101"},{"v":408.5247709978752,"d":"408.5"},{"v":2.0813799651357785,"d":"2.1"},{"v":0.13607235389885786,"d":"0.1361"},{"v":0.000584668943428364,"d":"0.0006"},{"v":234.06313647546793,"d":"234"},{"v":1.1508558175556824,"d":"1"},{"v":11026.5746795537,"d":"11027"},{"v":52.5381105024482,"d":"53"},{"v":10830.1510089127,"d":"10830"},{"v":111.425134083602,"d":"111"},{"v":421.203650823364,"d":"421.2"},{"v":2.14966895227285,"d":"2.1"},{"v":10762.7,"d":"10763"},{"v":111.4,"d":"111"}]
["WE-11",263.8,{"v":6469.999507276264,"d":"6470"},{"v":129.40026629587953,"d":"129"},{"v":15353.368003057134,"d":"15353"},{"v":308.43910667379356,"d":"308"},{"v":416.35479828079644,"d":"416.4"},{"v":1.8774061517420317,"d":"1.9"},{"v":0.1382867790180677,"d":"0.1383"},{"v":5.6375543528893563E-4,"d":"0.0006"},{"v":925.2500841951675,"d":"925"},{"v":3.7759392260679334,"d":"4"},{"v":11149.040738816,"d":"11149"},{"v":50.1349965427681,"d":"50"},{"v":11098.8693181755,"d":"11099"},{"v":56.0465638282763,"d":"56"},{"v":429.602317135495,"d":"429.6"},{"v":1.93791288681092,"d":"1.9"},{"v":11030.6,"d":"11031"},56]
["WE-12",298.9,{"v":10561.776166116151,"d":"10562"},{"v":211.23634809065325,"d":"211"},{"v":48994.02443298243,"d":"48994"},{"v":982.1398094054074,"d":"982"},{"v":442.4462944538847,"d":"442.4"},{"v":1.7631349092103816,"d":"1.8"},{"v":0.14780268487669798,"d":"0.1478"},{"v":5.510108581987846E-4,"d":"0.0006"},{"v":505.88762081058394,"d":"506"},{"v":1.7660885629118002,"d":"2"},{"v":11725.9502678089,"d":"11726"},{"v":48.3678888056489,"d":"48"},{"v":11629.7142862451,"d":"11630"},{"v":68.2186523091429,"d":"68"},{"v":457.207883421683,"d":"457.2"},{"v":1.82394648442944,"d":"1.8"},{"v":11561.4,"d":"11561"},{"v":68.2,"d":"68"}]
["WE-1",334.54,{"v":10314.533484785637,"d":"10315"},{"v":206.53848313788333,"d":"207"},{"v":8307.415080578412,"d":"8307"},{"v":167.99815873296163,"d":"168"},{"v":419.0865039335288,"d":"419.1"},{"v":2.0041817922602787,"d":"2.0"},{"v":0.1505006411490391,"d":"0.1505"},{"v":6.5600384143067638E-4,"d":"0.0007"},{"v":2966.8795408045808,"d":"2967"},{"v":14.559845699992268,"d":"15"},{"v":12160.4043340978,"d":"12160"},{"v":58.7011956764045,"d":"59"},{"v":12143.4270495516,"d":"12143"},{"v":59.3051589025645,"d":"59"},{"v":433.697816108347,"d":"433.7"},{"v":2.0751362854526,"d":"2.1"},12076,{"v":59.3,"d":"59"}]
[]
["Notes:"]
["aReported errors for 238U and 232Th concentrations are estimated to be ±1% due to uncertainties in spike concentration; analytical uncertainties are smaller."]
["bd234U = ([234U/238U]activity - 1) x 1000. "]
["c[230Th/238U]activity = 1 - e-l230T + (d234Umeasured/1000)[l230/(l230 - l234)](1 - e-(l230 - l234) T), where T is the age. \"Uncorrected\" indicates that no correction has been made for initial 230Th."]
["dAges are corrected for detrital 230Th assuming an initial 230Th/232Th of (4.2±2.2) x 10-6."]
["ed234Uinitial corrected was calculated based on 230Th age (T), i.e., d234Uinitial = d234Umeasured X el234*T, and T is corrected age."]
["fB.P. stands for “Before Present” where the “Present” is defined as the January 1, 1950 C.E.  "]
["Decay constants for 230Th and 234U are from Cheng et al. (2013); decay constant for 238U is 1.55125 x 10-10 yr-1 (Jaffey et al., 1971)."]