DOI: 10.6084/m9.figshare.23508861.v1
title: Data files used to plot Figures 1-6, Supplemental Figures 1 and 2 in Cottrell et al 2023, "No Late Cretaceous true polar wander oscillation and implications for stability of Earth relative to the rotation axis"

description: Also saved as Readme.txt <br> SupplTable1_June2023.xlsx: Supplementary Table 1: Directional data as reported by Mitchell et al 2021. This table has been filtered for repeated samples, and data not made available from the original data source. Column Headings: Section, stratigraphic section; Sample Name, sample identification of Mitchell et al 2021; Bin Age (Ma), age assigned by Mitchell et al 2021; Age (Ma), age of samples as reported by Mitchell et al 2021; GDec (o), GINc (o), Geographic Directions as reported by Mitchell et al 2021; SDec (o), SInc (o), stratigraphic directions as reported by Mitchell et al 2021; SPDec (o), SPInc (o), stratigraphic directions reported as northern hemisphere directions by Mitchell et al 2021. SupplTable2_June2023.xlsx: Supplementary Table 2: 1 million year binned average directions and poles for Apiro and Furlo sections. Section, Stratigraphic section; Age (Ma), binned ages from Suppl. Table 1; dec (o) and inc (o), Fisher directions of age bins; n, number of individual directions in each bin; alpha95 (o), circle of confidence radius for Fisher Means; Plon (o), Plat (o), A95 (o), poles calculated from directions in Suppl. Table 1 using section locations as reported in Mitchell et al 2021, binned and averaged and presented here. These poles are used for Supplementary Figures 1 and 2 in the Cottrell et al 2023 manuscript. Figure1data.xlsx: Table of published paleomagnetic poles as presented in Mitchell et al 2021. The published age bin (included for comparison) is corrected in the last column for bin age assignment based on data provided in the Mitchell et al 2021 publication. This data set forms the basis of Figure 1 in Cottrell et al 2023 manuscript. Figure2data.xlsx: Excel file of select data columns of two samples (C10AD253 and C10AD268) presented as reverse and normal polarity examples from the data set of Mitchell et al 2021. Each file is presented on a separate tab in a format compatible with MagIC database format. Original data can be downloaded via the link provided in Mitchell et al 2021. Original data files were filtered using python and bash scripts to select demagnetization step, magnetization moment, and stratigraphic corrected directions. Column headings Sample: sample name Demag Step (oC) - demagnetization step in degrees C Moment (emu) - Magnetization moment in electromagnetic units SDec (o) - declination corrected for geographic direction and strike/bedding dip SInc (o) - inclination corrected for geographic direction and strike/bedding dip Figure3data.zip: Zipped folder of hysteresis data presented in Figure 3 of Cottrell et al 2023. Data were collected on a Princeton Measurements Alternating Gradient Force Magnetometer Model 2900 with a P1 probe. The probe and diamagnetic/paramagnetic adjusted hysteresis data file and first order reversal curve files for each sample are provided. The PDF and text output of forcsensei (publically available python code for evaluating first order reversal curves) are also provided. Figure4data.xlsx: Excel file of data presented in Figure 4. The original demagnetization data files can be found in the link provided in Mitchell et al 2021. Magnetization moment of ~580 degrees C of each data file (580 degrees specifically was not always used as a demagnetization step by the original authors) was used to calculate the percent natural remanent magnetization remaining as normalized by the zero demagnetization step magnetization moment. Any sample line designated excursion or transition was removed from the analysis. Samples were grouped based on Chron designation into Normal (32n, 33n, 34n) or Reverse (32r, 33r). Histograms of % NRM remaining after demagnetization to 580 degrees were plotted in Figure 4. Figure5data.xlsx: Data file for plotting Figure 5. Originally presented in Mitchell et al 2021, and filtered for repeated data lines and files not made available for download. See Supplementary Data Table 1 for full details. Column headings Section - sedimentary section Sample Name - sample designation assigned by Mitchell et al 2021 Bin Age - Bin Age in millions of years as assigned by Mitchell et al 2021 Age - Age in millions of years as determined by Mitchell et al 2021 Chron - Chron assignment as determined by Mitchell et al 2021 SDec - Stratigraphic declination as presented by Mitchell et al 2021 SInc - Stratigraphic inclination as presented by Mitchell et al 2021 NRMleft580 - percent NRM remaining after demagnetization to ~580 degrees. See Methods in Cottrell et al 2023 for details. Figure6data.xlsx: Excel data file of filtered directional data presented in Mitchell et al 2021. Characteristic remanent magnetization directions and Low temperature component fits as presented in Mitchell et al 2021, and filtered for excluded data lines, repeated measurement lines, and only for the Apiro sedimentary section. Chron 33r and 33n data are presented in separate tabs. Column headings: Section - sedimentary section Sample Name - sample name as presented in Mitchell et al 2021 Bin Age - as presented in Mitchell et al 2021 Age - as presented in Mitchell et al 2021 Chron - chron assignment as presented in Mitchell et al 2021 GDec - geographic declination direction of the characteristic remanent magnetization, as presented in Mitchell et al 2021 GInc - geographic inclination direction of the characteristic remanent magnetizartion, as presented in Mitchell et al 2021 NRMleft580 - percent natural remanent magnetization remaining aftyer demagnetization to ~580 degrees LTGDec - low temperature geographic declination direction as presented by Mitchell et al 2021 LTGInc - low temperature geographic inclination direction as presented by Mitchell et al 2021 <br> <br> Figure 7 is a statistical model based on input parameters; there is no data associated with it.