DOI: 10.5061/dryad.bg7pd54
title: Data from: Palaeoclimatic reconstruction for a Cenomanian-aged angiosperm flora near Schefferville, Labrador

description: An understanding of local and regional climate trends is essential to
 investigate the remarkable angiosperm radiation that happened during the
 Albian-Cenomanian transition. However, many of the inland depositional
 environments pioneered by the first modern angiosperms are poorly
 represented in the fossil record. Eastern Canada in particular has a very
 poor Mesozoic record. In this paper, we present the first multivariate
 palaeoclimate analysis (CLAMP) for the environment of a geologically
 isolated woody dicot dominated flora found in the Redmond no.1 mine,
 Labrador, near Schefferville, with an estimated Cenomanian age. It reveals
 that the Redmond flora would have experienced a mean annual temperature of
 15.1 ± 2.1 °C, one of the coolest recorded for North America at this time.
 These results confer the Redmond no.1 site a warm temperate and fully
 humid climate with a hot summer, in accordance with previous qualitative
 palaeoclimate estimates. This flora fits smoothly into palaeolatitudinal
 MAT gradients that use other Cenomanian-estimated North American floras.
 Despite an inland setting, the climate analysis does not recover a
 significantly higher degree of seasonality than the sites to which it is
 compared, which agrees with established climate equability models for the
 Cretaceous and Paleogene. This study also introduces 15 new morphotypes
 discovered in recent fieldwork. The eventual description of the species
 they represent may refine our dating estimates for the Redmond Formation.
 A greater understanding of the depositional environment and of the natural
 history of these angiosperms is required to improve this community’s
 characterization, along with estimates from other proxies.
description: Morphotype catalogue
 appendixThis is an exhaustive
 description of all 42 angiosperm leaf morphotypes currently identified
 from the Redmond flora to conduct palaeoclimate analyses. Each morphotype
 has its size class, margin, tooth and lobe characters (if necessary),
 base, apex, and venation characters. In addition, each morphotype's
 quality index and the curated specimens that represent it are presented.
 Those that have been the object of a more systematic study in the past
 have a systematic affinity. In some cases, new specimens have been
 assigned to an already existing morphotype or new specimens are
 sufficiently distinct morphologically to warrant the creation of a new
 morphotype altogether. In those cases, a discussion is provided to explain
 these decisions.Redmond
 ScoresheetThis spreadsheet lists
 the CLAMP physiognomic character states of all 46 angiosperm leaf
 morphotypes detected in the Redmond Formation flora, Labrador
 (Cenomanian). The blank was initially downloaded from the CLAMP website:
 http://clamp.ibcas.ac.cn/CLAMP_Scoring.html.Ft Harker
 ScoresheetThis spreadsheet lists
 the CLAMP physiognomic character states of all 92 angiosperm leaf
 morphotypes detected in the Dakota Formation flora of Fort Harker, Kansas
 (Cenomanian). The blank spreadsheet was initially downloaded from the
 CLAMP website:
 http://clamp.ibcas.ac.cn/CLAMP_Scoring.html.Rose Creek
 ScoresheetThis spreadsheet lists
 the CLAMP physiognomic character states of all 18 angiosperm leaf
 morphotypes detected in the Rose Creek assemblage from the Dakota
 Formation (Cenomanian). The climate parameters derived from these leaf
 physiognomic character states are subsequently compared with those of the
 Redmond flora and of Ft Harker. The blank spreadsheet was initially
 downloaded from the CLAMP website:
 http://clamp.ibcas.ac.cn/CLAMP_Scoring.html.