Citation:

PANGAEA.967147

Name: BrGDGT-based temperature evolution through an Eocene hyperthermal event
Published: 2024-09-23
License: https://creativecommons.org/licenses/by/4.0/
Keywords: brGDGTs; Eocene; hyperthermal event; maar lakes; terrestrial temperatures

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Published: 2024-09-23 • DOI registered: 2024-09-23

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Abstract:

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) from maar sediments were analyzed in order to reconstruct continental air temperatures across a middle Eocene (47.2 Ma) hyperthermal event. Additionally, carbon isotopes of total organic carbon (δ13C TOC) were measured from the same samples to reconstruct changes in global and local carbon cycle. Measurements for both, brGDGTs and carbon isotopes, were carried out between beginning of 2021 and end of 2022. Based on the current age model the temporal resolution of the samples is millennial to sub-millennial. Sediment samples (organic-rich pelites) are from the FB2001 drill core, recovered from the Messel Fossil Site located in the vicinity of Frankfurt, Germany. The brGDGTs were solvent extracted by Soxhlet apparatus and further analyzed by high-performance liquid chromatography (HPLC-) - atmospheric pressure chemical ionization (APLCI-) - mass spectrometry (MS). Aliquots for total organic carbon isotope measurements were decalcified with HCl (10%) prior analyses on a Flash Elemental Analyzer.

Keyword(s):

brGDGTs; Eocene; hyperthermal event; maar lakes; terrestrial temperatures

Supplement to:

Schmitt, Clemens; Vasiliev, Iuliana; Meijer, Niels; Brugger, Julia; Kaboth-Bahr, Stefanie; Bahr, André; Mulch, Andreas (2024): Eocene maar sediments record warming of up to 3.5 °C during a hyperthermal event 47.2 million years ago. Communications Earth & Environment, 5(1), 471, https://doi.org/10.1038/s43247-024-01628-9

References:

Kaboth-Bahr, Stefanie; Schmitt, Clemens; Bauersachs, Thorsten; Zeeden, Christian; Wonik, Thomas; Schandl, Jonas; Lenz, Olaf K; Wedmann, Sonja; Vasiliev, Iuliana; Mulch, Andreas; Lourens, Lucas Joost; Pross, Jörg; Bahr, André (2024): Improved chronostratigraphy for the Messel Formation (Hesse, Germany) provides insight into early to middle Eocene climate variability. Newsletters on Stratigraphy, 103805, https://doi.org/10.1127/nos/2024/0799

Project(s):

Vergangene Warmzeiten als natürliche Analoge unserer 'hoch CO2' Klimazukunft - Past warm periods as natural analogues of our 'high CO2' climate future (VeWa)

Coverage:

Latitude: 49.913902 * Longitude: 8.754740

Date/Time Start: 2021-02-02T00:00:00 * Date/Time End: 2022-10-19T00:00:00

Minimum DEPTH, sediment/rock: 1.02 m * Maximum DEPTH, sediment/rock: 11.49 m

Event(s):

Messel_FB2001_2 * Latitude: 49.913902 * Longitude: 8.754740 * Date/Time Start: 2021-02-02T00:00:00 * Date/Time End: 2022-10-19T00:00:00 * Location: Messel, Germany * Method/Device: Core drilling (CDRILL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Schmitt, Clemens
2	DEPTH, sediment/rock	Depth sed	m	Schmitt, Clemens		Geocode
3	AGE	Age	ka BP	Schmitt, Clemens		Geocode
4	Isoprenoid acyclic glycerol dialkyl glycerol tetraether, fractional abundance	iso GDGT-0		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
5	Isoprenoid monocyclic glycerol dialkyl glycerol tetraether, fractional abundance	iso GDGT-1		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
6	Isoprenoid dicyclic glycerol dialkyl glycerol tetraether, fractional abundance	iso GDGT-2		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
7	Isoprenoid tricyclic glycerol dialkyl glycerol tetraether, fractional abundance	iso GDGT-3		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
8	Isoprenoid glycerol dialkyl glycerol tetraether, 4, fractional abundance	iso GDGT-4		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
9	Crenarchaeol isomer, fractional abundance	Cren iso		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
10	Branched glycerol dialkyl glycerol tetraether, Ia, fractional abundance	brGDGT Ia		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
11	Branched glycerol dialkyl glycerol tetraether, Ib, fractional abundance	brGDGT Ib		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
12	Branched glycerol dialkyl glycerol tetraether, Ic, fractional abundance	brGDGT Ic		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
13	Branched glycerol dialkyl glycerol tetraether, IIa, fractional abundance	brGDGT IIa		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
14	Branched glycerol dialkyl glycerol tetraether, IIa', fractional abundance	brGDGT IIa'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
15	Branched glycerol dialkyl glycerol tetraether, IIb, fractional abundance	brGDGT IIb		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
16	Branched glycerol dialkyl glycerol tetraether, IIb', fractional abundance	brGDGT IIb'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
17	Branched glycerol dialkyl glycerol tetraether, IIc, fractional abundance	brGDGT IIc		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
18	Branched glycerol dialkyl glycerol tetraether, IIc', fractional abundance	brGDGT IIc'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
19	Branched glycerol dialkyl glycerol tetraether, IIIa, fractional abundance	brGDGT IIIa		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
20	Branched glycerol dialkyl glycerol tetraether, IIIa', fractional abundance	brGDGT IIIa'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
21	Branched glycerol dialkyl glycerol tetraether, IIIb, fractional abundance	brGDGT IIIb		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
22	Branched glycerol dialkyl glycerol tetraether, IIIb', fractional abundance	brGDGT IIIb'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
23	Branched glycerol dialkyl glycerol tetraether, IIIc, fractional abundance	brGDGT IIIc		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
24	Branched glycerol dialkyl glycerol tetraether, IIIc', fractional abundance	brGDGT IIIc'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
25	Methylation index of 5-methyl branched glycerol dialkyl glycerol tetraether	MBT5ME		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
26	Cyclization ratio of branched tetraethers prime	CBT'		Schmitt, Clemens	Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS)
27	Temperature, air, annual mean	MAAT	°C	Schmitt, Clemens
28	pH	pH		Schmitt, Clemens
29	Acyclic glycerol dialkyl glycerol tetraether/Crenarchaeol ratio	GDGT-0/Cren		Schmitt, Clemens	Calculated
30	δ13C, total organic carbon	δ13C TOC	‰ PDB	Schmitt, Clemens	Elemental analyser
31	Carbon, organic, total	TOC	%	Schmitt, Clemens	Calculated
32	Sample comment	Sample comment		Schmitt, Clemens

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

974 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Sample label	2 Depth sed [m]	3 Age [ka BP]	4 iso GDGT-0	5 iso GDGT-1	6 iso GDGT-2	7 iso GDGT-3	8 iso GDGT-4	9 Cren iso	10 brGDGT Ia	11 brGDGT Ib	12 brGDGT Ic	13 brGDGT IIa	14 brGDGT IIa'	15 brGDGT IIb	16 brGDGT IIb'	17 brGDGT IIc	18 brGDGT IIc'	19 brGDGT IIIa	20 brGDGT IIIa'	21 brGDGT IIIb	22 brGDGT IIIb'	23 brGDGT IIIc	24 brGDGT IIIc'	25 MBT5ME	26 CBT'	27 MAAT [°C]	28 pH	29 GDGT-0/Cren	30 δ13C TOC [‰ PDB]	31 TOC [%]	32 Sample comment
not defined	1.02	47220.093																											-30.80		δ13C TOC from Bauersachs et al., 2014
GM 1463	1.09	47220.421																											-31.41	40.9
GM 1461	1.26	47221.218	0.936509733	0.030556813	0.021616116	0.007129923	0.004187415	0.000000000	0.554376622	0.124961943	0.016540417	0.081338865	0.120872280	0.038170194	0.011723702	0.004453189	0.013859416	0.014949993	0.018267164	0.000486216	0.000000000	0	0	0.833596429	-0.555048653	25.11	7.5	224	-30.99	40.0
GM 1459	1.48	47222.250	0.930174551	0.028061132	0.027281656	0.008860043	0.004910698	0.000711921	0.536213974	0.108663229	0.017506854	0.077413673	0.132100396	0.033060610	0.012215736	0.003100098	0.016725615	0.037996619	0.023117569	0.001448843	0.000436784	0	0	0.813784558	-0.508424590	24.40	7.6	189	-30.72	41.3	δ13C TOC from Kaboth-Bahr et al., (2024)
GM 1457	1.68	47223.187																											-30.21	44.2
GM 1455	1.88	47224.125	0.928092141	0.033935779	0.025683215	0.007635550	0.004653315	0.000000000	0.527514146	0.140219572	0.019657792	0.087468158	0.084312090	0.043283212	0.012669357	0.004179535	0.015870511	0.042832345	0.018260105	0.002092022	0.001641155	0	0	0.794530114	-0.635087199	23.74	7.3	199	-31.52	43.8
not defined	1.97	47224.546																											-31.10		δ13C TOC from Bauersachs et al., 2014
GM 1453	2.08	47225.063																											-32.18	50.4
GM 1451	2.28	47226.000	0.880904204	0.108733419	0.010362377	0.000000000	0.000000000	0.000000000	0.541474947	0.108676310	0.011630272	0.084526019	0.127106795	0.035717009	0.016905204	0.003292066	0.008961029	0.037178738	0.023387650	0.001143961	0.000000000	0	0	0.804602142	-0.547494284	24.22	7.5		-30.51	45.0	δ13C TOC from Kaboth-Bahr et al., (2024)
GM 1450	2.38	47226.469	0.913619302	0.036355910	0.035175524	0.011898298	0.002950967	0.000000000	0.481636093	0.133270618	0.013082079	0.100442929	0.098483067	0.043704923	0.015678896	0.004723267	0.021509486	0.059285826	0.026654124	0.001528692	0.000000000	0	0	0.751051836	-0.563056620	22.58	7.5	310	-29.92	45.3
GM 1449	3.08	47229.751	0.937607681	0.031352181	0.020408495	0.005634519	0.003919023	0.001078101	0.491270185	0.156034110	0.020655678	0.098533168	0.112768838	0.039078310	0.026601164	0.002727108	0.001339828	0.023586551	0.024535596	0.001306332	0.001563132	0	0	0.802947384	-0.514818196	24.15	7.6	239	-32.17	48.6
GM 1448	3.13	47229.985	0.944171049	0.030073596	0.017694465	0.004546009	0.003287114	0.000227767	0.501495841	0.156068964	0.019368115	0.094678956	0.114565860	0.038001280	0.027582271	0.002779843	0.001128366	0.020275996	0.022610545	0.000843032	0.000600930	0	0	0.812967607	-0.520721624	24.59	7.6	287	-32.61	48.6
GM 1447	3.28	47230.689																											-31.89	44.2
GM 1446	3.38	47231.157	0.943808797	0.029697432	0.016048818	0.005105517	0.004556318	0.000783117	0.507771281	0.155901651	0.015153799	0.092826937	0.115835323	0.034948945	0.028443126	0.002007283	0.001352734	0.022611690	0.021183583	0.001221825	0.000741822	0	0	0.816661576	-0.532871110	24.93	7.5	207	-31.56	48.2
GM 1445	3.48	47231.626	0.927738787	0.038705985	0.020331938	0.005542336	0.005813428	0.001867526	0.504284693	0.148867605	0.018893406	0.097057533	0.113982157	0.034160107	0.027632038	0.002476521	0.001153638	0.026803077	0.021483910	0.001771904	0.001433412	0	0	0.807220468	-0.531878864	24.41	7.5	160	-33.14	48.8
GM 1444	3.58	47232.095	0.913738817	0.043567444	0.028259963	0.006900141	0.006240742	0.001292893	0.530589091	0.158718335	0.018679486	0.085375567	0.109441162	0.028764117	0.023950998	0.002555537	0.001226199	0.021315242	0.017991898	0.000727698	0.000664669	0	0	0.836866559	-0.568916895	25.24	7.4	146	-32.89	51.1
GM 1443	3.68	47232.564	0.941205999	0.031122545	0.019545711	0.004768777	0.003356968	0.000000000	0.503557207	0.174173204	0.017979169	0.094812026	0.105346696	0.034132329	0.024861820	0.001797917	0.001432715	0.022825117	0.017276858	0.001046444	0.000758496	0	0	0.819178671	-0.568809031	24.62	7.4	280	-31.27	54.4
not defined	3.76	47232.937																											-31.44		δ13C TOC from Bauersachs et al., 2014
GM 1442	3.78	47233.033	0.913419564	0.042002627	0.029897066	0.006841476	0.006071122	0.001768146	0.521622076	0.143446071	0.019729093	0.089180549	0.112737675	0.032769645	0.024819115	0.002624937	0.001194683	0.021327612	0.027637557	0.001766784	0.001144203	0	0	0.824361688	-0.528356153	24.87	7.5	150	-33.43	54.7
GM 1441	3.88	47233.502	0.925748657	0.036351387	0.021568490	0.007100638	0.007246043	0.001984786	0.595914847	0.114086329	0.016230839	0.074489356	0.109381738	0.030070177	0.018269495	0.002081781	0.000858588	0.019092798	0.017132552	0.001438821	0.000952680	0	0	0.852418884	-0.626808918	25.63	7.3	128	-33.29	51.8
GM 1440	3.94	47233.783	0.919058061	0.035656402	0.027266660	0.009114310	0.006425779	0.002478787	0.544716252	0.116180739	0.015998659	0.106657728	0.109324171	0.034549485	0.017674709	0.002041734	0.000963729	0.026702524	0.022398123	0.001824609	0.000967538	0	0	0.799312690	-0.607712856	24.22	7.3	143	-32.78	42.0
GM 1439	4.08	47234.439	0.894197507	0.095729173	0.010073320	0.000000000	0.000000000	0.000000000	0.640566235	0.102110063	0.014967686	0.073569983	0.093865151	0.023212598	0.014016350	0.001877303	0.000894256	0.018329073	0.015919022	0.000672277	0.000000000	0	0	0.866242223	-0.719707344	26.28	7.0		-33.48	42.2
GM 1438	4.18	47234.908	0.900877974	0.042499046	0.037663825	0.011859015	0.007100140	0.000000000	0.582919735	0.134979365	0.015349423	0.091379836	0.101533151	0.028548733	0.020127454	0.002072471	0.000860046	0.021560863	0.000000000	0.000668924	0.000000000	0	0	0.836268025	-0.703052137	25.32	7.1	127	-34.03	49.0
GM 1437	4.28	47235.377	0.908476612	0.045423831	0.030783092	0.004073129	0.008709363	0.002533974	0.543493030	0.138590723	0.015543901	0.097828745	0.109785592	0.030163863	0.021739721	0.001956575	0.001059811	0.022500611	0.017337428	0.000000000	0.000000000	0	0	0.820663640	-0.603341937	24.73	7.4	104	-35.17	48.7
GM 1436	4.38	47235.846	0.945229682	0.026943463	0.017167256	0.003504122	0.007155477	0.000000000	0.579819698	0.113386963	0.009062367	0.068289875	0.142163200	0.018983726	0.028260842	0.001524711	0.000554050	0.016535599	0.020830560	0.000588410	0.000000000	0	0	0.869572154	-0.519672574	26.42	7.6	132	-30.05	35.7
GM 1435	4.48	47236.315	0.920326629	0.034989777	0.026741566	0.006815626	0.009159855	0.001966547	0.615243438	0.092807908	0.008446562	0.049897286	0.154853645	0.014286161	0.028311626	0.001053213	0.000667383	0.012200590	0.021012128	0.000568318	0.000651741	0	0	0.902464012	-0.500509313	27.58	7.6	100	-28.30	21.2
GM 1434	4.58	47236.783	0.961989010	0.020056228	0.014625073	0.000000000	0.003329689	0.000000000	0.604366099	0.114598381	0.006704170	0.054822280	0.145312068	0.012054297	0.030977891	0.001152589	0.000601064	0.010964456	0.017668626	0.000309118	0.000468962	0	0	0.901830092	-0.521397385	27.39	7.6	289	-27.96	33.9
GM 1433	4.68	47237.252	0.961065372	0.022698199	0.012333126	0.000000000	0.003903303	0.000000000	0.631622777	0.068808068	0.008292254	0.057163626	0.157023539	0.017431377	0.019866124	0.001432619	0.000860983	0.013620469	0.023324171	0.000553993	0.000000000	0	0	0.887711265	-0.525680372	26.98	7.6	246	-29.09	34.5
GM 1432	4.78	47237.721	0.957319707	0.024728654	0.012856879	0.001987891	0.003106869	0.000000000	0.638686472	0.079929184	0.010159223	0.080676186	0.107568248	0.028759566	0.015201485	0.001583644	0.000728327	0.019459395	0.016247287	0.001000982	0.000000000	0	0	0.848148696	-0.692724976	25.69	7.1	308	-27.77	32.8
GM 1431	4.88	47238.190	0.949131317	0.025164860	0.016287807	0.002496671	0.005785936	0.001133409	0.578106934	0.108746602	0.015843255	0.083434893	0.112183994	0.036561357	0.018999406	0.002456173	0.001340583	0.022218056	0.016811975	0.001949939	0.001346833	0	0	0.829270631	-0.613421446	25.02	7.3	164	-29.57	36.6	δ13C TOC from Kaboth-Bahr et al., (2024)
GM 1430	4.97	47238.612	0.949125586	0.025748238	0.016064592	0.002039337	0.007022247	0.000000000	0.608089261	0.102092050	0.012831241	0.076987448	0.113249651	0.028953975	0.017629010	0.002108787	0.001232915	0.018131102	0.017740586	0.000953975	0.000000000	0	0	0.851410477	-0.635740437	25.75	7.3	135	-29.71	39.3
GM 1429	5.09	47239.174	0.944532488	0.030903328	0.014072900	0.004627575	0.005863708	0.000000000	0.608166811	0.075428481	0.008490641	0.071874260	0.149277308	0.027801911	0.014098412	0.001583603	0.001863992	0.018166022	0.022352105	0.000896454	0.000000000	0	0	0.852835404	-0.551545514	25.85	7.5	161	-29.33	35.5
GM 1427	5.28	47240.065	0.926736563	0.036471568	0.022976234	0.006747667	0.005765412	0.001302556	0.576964822	0.083974088	0.010282541	0.078261565	0.149668102	0.023192843	0.021878963	0.001730894	0.003341826	0.025249352	0.024106847	0.000662653	0.000685503	0	0	0.839387640	-0.510668258	25.57	7.6	161	-28.99	30.8
GM 1423	5.68	47241.940	0.926036706	0.035653610	0.026321457	0.007106793	0.004881434	0.000000000	0.617954128	0.105496036	0.012256659	0.054967190	0.119152481	0.022737981	0.018709329	0.003001004	0.004472486	0.023489085	0.016797427	0.000467733	0.000498460	0	0	0.875943563	-0.607622616	26.55	7.3	190	-30.18	43.5
not defined	5.70	47242.031																											-28.02		δ13C TOC from Bauersachs et al., 2014
GM 1419	6.08	47243.816																											-26.80	41.9
GM 1415	6.48	47245.691	0.937242258	0.032241134	0.021294144	0.006048337	0.003174127	0.000000000	0.643686656	0.071818743	0.006138863	0.063176653	0.142445473	0.020234409	0.012873733	0.001367834	0.001370814	0.014691552	0.021724425	0.000470845	0.000000000	0	0	0.878859254	-0.592147522	26.60	7.4	295	-27.64	35.2
GM 1411	6.88	47247.566																											-29.16	40.7
GM 1407	7.28	47249.442	0.948721770	0.031442312	0.015448535	0.001792030	0.002595354	0.000000000	0.707263211	0.086564648	0.007973778	0.041234264	0.103495273	0.017667927	0.016193324	0.001054068	0.000827416	0.009066077	0.007973778	0.000453304	0.000232933	0	0	0.920739050	-0.743661671	28.02	7.0	366	-28.30	38.5
GM 1402	7.78	47252.309																											-27.58	39.7
not defined	7.94	47253.274																											-25.10		δ13C TOC from Bauersachs et al., 2014
GM 1398	8.18	47254.734	0.933427999	0.064316739	0.002255262	0.000000000	0.000000000	0.000000000	0.629269990	0.069848969	0.007236605	0.076770939	0.140956478	0.015668823	0.014787845	0.001573175	0.001434736	0.020954691	0.021017618	0.000480133	0.000000000	0	0	0.860021453	-0.593344112	26.08	7.4		-26.95	32.2
GM 1397	8.28	47255.341																											-26.76	39.4
GM 1392	8.78	47258.373	0.962255527	0.018763983	0.012966393	0.003536289	0.002477808	0.000000000	0.586819733	0.072489496	0.009024203	0.093200781	0.160265893	0.019478470	0.010799456	0.001602659	0.001247608	0.022979663	0.022092037	0.000000000	0.000000000	0	0	0.829614667	-0.538542150	25.23	7.5	388	-28.74	38.6
not defined	8.99	47259.641																											-29.61		δ13C TOC from Bauersachs et al., 2014
GM 1385	9.49	47262.679																											-29.01	46.5
GM 1365	11.49	47274.807	0.960665209	0.017935460	0.012618714	0.002692601	0.004928829	0.001159187	0.566145571	0.104891578	0.016204404	0.104219197	0.101529669	0.034358716	0.016002690	0.003335014	0.002770213	0.029584804	0.018288788	0.001970079	0.000699277	0	0	0.800291271	-0.653350208	23.84	7.2	195	-29.31	35.8	δ13C TOC from Kaboth-Bahr et al., (2024)