#Bretskyan_hiearchy
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andrejpaleo.bsky.social
The R package 'hespdiv' is now in the CRAN! 🥳
cran.rstudio.com/web/packages...
cran.rstudio.com/web/packages...
Now automatic hierarchical and statistically testable contiguous bioregionalization is available for everyone!
#Bretskyan_hiearchy
🧪⚒️ #EvoBio #Paleobio #Geology #Biogeography #Macroecology
The description of the R package ‘hespdiv’
May 24, 2026 at 7:47 PM
andrejpaleo.bsky.social
#Bretskyan_hiearchy of the Cambrian Explosion:
"This periodic fluctuation in nutrient supply...by..orbital parameters...stimulated the evolution..Cambrian metazoans by altering..connectivity of paleocean habitats"
doi.org/10.1016/j.pa...
🧪⚒️ #Paleobio #Geology #Biogeography
Detrended GR series (left) of Niutitang Formation of Well SNZ1 shown with interpreted long-eccentricity cycles (light yellow, 405-kyr) and their corre sponding MTM power spectrum with confidence levels (right). The GR series was detrended by removing a 20% LOWESS trend. The evolutionary power spectra of GR were calculated using a 20 m sliding window with a 0.5 m step. Fig. 1. (a) Early Cambrian paleogeographic reconstruction and mean surface temperature distribution, modified from Zeng et al. (2026); (b) Paleogeographic and depositional setting of the study area in South China, modified from Gao et al. (2021); (c) Lithostratigraphic column and natural GR log of the Cambrian Niutitang Formation. GR data are sourced from Chen et al. (2022). S=Sinian, DY=Dengying Formation, KCP=Kuanchuanpu Formation, SP=Shipai Formation.
June 1, 2026 at 9:52 AM