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Morphometric variance, evolutionary constraints and their change through time in Late Devonian Palmatolepis conodonts.
Renaud S, Girard C, Dufour AB. Renaud S, et al. Evolution. 2021 Nov;75(11):2911-2929. doi: 10.1111/evo.14330. Epub 2021 Oct 6. Evolution. 2021. PMID: 34396530
Shape was quantified using 2D geometric morphometrics in Palmatolepis conodonts through the Late Devonian period. Patterns of variance were characterized along the record by the variance-covariance matrix (P-matrix) and its first axis (Pmax). ...A shape response was associ …
Shape was quantified using 2D geometric morphometrics in Palmatolepis conodonts through the Late Devonian period. Patterns of varianc …
Disparity changes in 370 Ma Devonian fossils: the signature of ecological dynamics?
Girard C, Renaud S. Girard C, et al. PLoS One. 2012;7(4):e36230. doi: 10.1371/journal.pone.0036230. Epub 2012 Apr 27. PLoS One. 2012. PMID: 22558396 Free PMC article.
The study was focused on the emblematic genus of the period, Palmatolepis. Strikingly, both crises affected an already impoverished Palmatolepis disparity, increasing risks of random extinction. ...Disparity changes of Palmatolepis thus reflect changes in the …
The study was focused on the emblematic genus of the period, Palmatolepis. Strikingly, both crises affected an already impoverished …
Search for impact remains at the Frasnian-Famennian boundary in the stratotype area, southern France.
Girard C, Robin E, Rocchia R, Froget L, Feist R. Girard C, et al. Palaeogeogr Palaeoclimatol Palaeoecol. 1997 Aug;132(1-4):391-7. doi: 10.1016/s0031-0182(97)00049-7. Palaeogeogr Palaeoclimatol Palaeoecol. 1997. PMID: 11541727
The latter is investigated in more detail because it is the least condensed across the boundary, which is determined by the first occurrence of the typical morphotype of Palmatolepis triangularis, the indicator of the first Famennian conodont biozone. ...
The latter is investigated in more detail because it is the least condensed across the boundary, which is determined by the first occurrence …
Platinum group element enrichments and possible chondritic Ru:Ir across the Frasnian-Famennian boundary, western New York State.
Over DJ, Conaway CA, Katz DJ, Goodfellow WD, Gregoire DC. Over DJ, et al. Palaeogeogr Palaeoclimatol Palaeoecol. 1997 Aug;132(1-4):399-410. doi: 10.1016/s0031-0182(97)00064-3. Palaeogeogr Palaeoclimatol Palaeoecol. 1997. PMID: 11541728
In western New York State the boundary is a distinct horizon within a pyritic black shale bed of the upper Hanover Shale defined by the first occurrence of Palmatolepis triangularis in the absence of Frasnian conodonts. The boundary is characterized by a minor disconformit …
In western New York State the boundary is a distinct horizon within a pyritic black shale bed of the upper Hanover Shale defined by the firs …