Late paleozoic climate revealed by coral fossil patterns

exceed the values of the respective peaks. A high level of confidence (95%) supports the conclu- sion of a significant difference between the trough and peak data for the DZ-30-16 and DZ-30- 24 samples.For the full analysisplease refer to the S3 File. Errors in the measurement (1) Systematic error of the microscope The total magnification rangeof the Nikon SMZ1500 microscope is 3.75–540X. According to the wave-particle duality of light, the resolution limit of the optical microscope can be obtained at 0.2 μm. While the measured growth line widths are all above 30 μm, it is far over the resolution limit of this optical microscope, so the growth line width can be observed using the SMZ1500. To obtain accurate measurement data, magnification and external environmental condi- tions were kept consistent during the measurement until the measurement of all samples is completed. Fig 5. Diagram of coral fossil DZ-30-24 and enlargements of each part on coral epitheca (Late Carboniferous ~310 Ma, Shiqiantan Formation). More specimen details are included in the “S2 File”. https://doi.org/10.1371/journal.pone.0290127.g005 PLOS ONE Late paleozoic climate revealed PLOS ONE | https://doi.org/10.1371/journal.pone.0290127 August 15, 2023 6 / 13