BSGF - Earth Sci. Bull.
Volume 191, 2020
Special Issue L’Ambre
Article Number 16
Number of page(s) 5
Published online 11 June 2020

© J.-D. Moreau et al., Published by EDP Sciences 2020

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1 Introduction

Plant remains such as bryophytes, conifer leafy axes, ferns, and flowers have been reported in Cretaceous amber from many localities worldwide (Chambers et al., 2010; Crepet et al., 2016; Ignatov et al., 2016; Schneider et al., 2016; Moreau et al., 2017a; Kvaček et al., 2018). However, such fossil inclusions remain extremely rare in the French Cretaceous amber which has otherwise yielded abundant and diverse fossils of arthropods (Néraudeau et al., 2002, 2008; Nel et al., 2004; Perrichot, 2005, 2015; Perrichot et al., 2008a, 2008b, 2010), microorganisms (Breton and Tostain, 2005; Girard et al., 2009), as well as rare vertebrate integuments (Perrichot et al., 2008c; Vullo et al., 2010a). Plant meso- or macroremains found in this amber are commonly indeterminable, altered, and limited to stellate hairs (Girard, 2010), or tiny fragments of cuticle or wood sometimes preserved as partially empty casts (Perrichot, 2005; Girard et al., 2013). Until now, a single foliar plant remain was described in amber from La Buzinie in the Charente department (Moreau et al., 2017a). It consists of an exquisitely preserved conifer leafy axis ascribed to Glenrosa carentonensis Moreau, Néraudeau, Tafforeau & Dépré, an extinct Cretaceous taxon characterized by an unusual stomatal arrangement inside crypts (Moreau et al., 2015). Recently, several leafy axes and a cone were discovered in the Cenomanian amber from the palaeontological site of Fouras which has hitherto provided various insect and vertebrate fossils (Néraudeau et al., 2003; Vullo et al., 2005). Here, we describe these specimens and discuss palaeoecophysiological implications.

2 Geological setting

The pieces of amber containing the plant remains described herein were discovered in Cretaceous deposits from the “Plage de la Vierge” at Fouras – Bois Vert in the Charente-Maritime department (western France). Regionally, the upper Albian–Cenomanian series are divided into seven units, A to G (Néraudeau and Moreau, 1989; Moreau, 1996; Néraudeau et al., 1997). At Fouras – Bois Vert, the deposits are exposed from subunit B1 to subunit B3 which are early Cenomanian in age based on the presence of the foraminifera Orbitolina (Conicorbitulina) conica d’Archiac in the three subunits (Néraudeau et al., 2003). Subunit B1 consists of up to 5 m of fossiliferous silty to sandy limestone yielding rudists (Ichthyosarcolites triangularis Desmarest), oysters (Rhynchostreon suborbiculatum Lamarck) and the foraminifera Orbitolina plana concava Lamarck. Subunit B2 corresponds to up to 5 m of marl and glauconitic sand. Basally, this subunit (B2ms) consists of laminated grey to lignitic clay yielding abundant wood fragments (sometimes large trunks of up to 3 m long), amber and vertebrate remains (Néraudeau et al., 2003; Perrichot, 2005; Vullo et al., 2005). The wood was mainly ascribed to coniferous taxa such as Agathoxylon gardoniense Crié, Brachyoxylon Hollick & E. Jeffrey and Podocarpoxylon Gothan whereas a single specimen was ascribed to the Ginkgoalean wood Ginkgoxylon Saporta. The surface of trunks often bears marine oysters (Acutostrea lingularis Lamarck, Gyrostrea cf. delettrei Coquand) and xylophagous bivalve borings (Teredolites Leymerie). Amber from B2ms yielded various insect inclusions (Perrichot et al., 2010), among which occur some of the oldest known ants and trogossitid beetles (Perrichot et al., 2008b; Peris et al., 2014). The vertebrate remains were ascribed to terrestrial groups, such as dinosaurs (Iguanodontids; Néraudeau et al., 2003), pterosaurs (Vullo and Néraudeau, 2009) and turtles (Solemys de Lapparent de Broin & Murelaga; Vullo et al., 2010b), as well as marine ones such as the snake Simoliophis rochebrunei Sauvage and the shark Cretodus semiplicatus Agassiz (Vullo et al., 2005, 2011).

Upper part of the subunit B2 corresponds to sandstone with accumulation of oysters (Rhynchostreon suborbiculatum, Ceratostreon flabellatum Goldfuss). The subunit B3 consists of 6–8 m of limestone alternating with silty to sandy marl.

3 Material and methods

The pieces of amber were all collected in the subunit B2 (layer B2ms). The fossiliferous amber from Fouras – Bois Vert is mostly translucent and yellow to orange (Figs. 1A and 1B). Plant remains consist of three leafy axes and one conifer cone, that were originally preserved in two amber pieces with numerous arthropod inclusions: the piece IGR.FRS-1 contained 13 hexapods; and the piece IGR.FRS-7 contained 57 arthropods (see detailed list in Cockx et al., 2016: Tab. 1). For an optimal study of each fossil inclusion, these pieces were then cut in smaller fragments using scalpel blades, and each fragment was polished using silicon carbide papers on a Buehler Metaserv 3000 polisher. The conifer remains are preserved in three dimensions and show an exquisite preservation of the cuticle including stomatal apparatuses. Photographs were taken with a BMS digital USB camera (5 megapixels) mounted on a stereomicroscope Leica 125. The specimens presented in this paper are housed at the Geological Department and Museum of the University of Rennes 1.

thumbnail Fig. 1

Plant inclusions in Cenomanian amber from Fouras – Bois Vert. A–B. Fragment of amber bearing a conifer cone (A) and leafy axis (B); black arrow indicates location of the cone. C–H. Helically arranged conifer leafy axis, Pagiophyllum sp. I–J. Abaxial surface of a leaf showing alignment of stomatal apparatuses; black arrows indicate location of stomatal apparatuses. K–L. Cone of conifer, Classostrobus. A, K–L. IGR.FRS-7.18; B, G–H, IGR.FRS-1.14; C–D. IGR.FRS-7.25; E–F. IGR.FRS-7.10. Scale bars: A = 10 mm; B = 5 mm; C–H = 1 mm; I–L = 0.5 mm.

4 Systematic palaeobotany

Order – Coniferales

Family – Cheirolepidiaceae

4.1 Leafy axes

Genus – Pagiophyllum Heer, emend. Harris, 1979

Pagiophyllum sp.

Figs. 1C1J

Material. 3 specimens; IGR.FRS-7.10, IGR.FRS-1.14, IGR.FRS-7.25.

Description. Leafy axes are straight (Figs. 1C, 1D, 1G, 1H) to slightly curved (Figs. 1E and 1F). The largest specimen is 10 mm long. Shoots are narrow and up to 1.5 mm in diameter. Leaves are persistent, helically arranged (phyllotaxy 3/8), highly adpressed and imbricated (Figs. 1C1H). Leaves are scale-like, rhomboidal, longer than wide, and keeled on abaxial side (Figs. 1C1J). They are 1.7–2.5 mm long and 0.6–0.8 mm wide. Apically, leaves display a free part which is up to 0.8 mm long. The abaxial surface of leaves is convex whereas adaxial surface is concave. The leaf margin is entire and the shape of the leaf apex is quite pointed. Surface of leaves locally shows the outlines of epidermal cells. On the abaxial surface, stomatal apparatuses are arranged in longitudinal rows that converge toward the leaf apex (Figs. 1I and 1J). Stomatal apparatuses on the abaxial surface are 50–70 µm long and 35–45 µm wide. Stomatal rows are not sunken but guard cells of individual stomata are sunken in a pit. Pit apertures are mainly oval, and sometimes circular. Their orientation is quite stable, mainly oriented transversally to the leaf margin. However, they are sometimes oriented obliquely to leaf margin. Subsidiary cells form a thick and well-marked rim around the pit apertures. Abaxial surface of leaves partially shows the shape of ordinary epidermal cells which are rectangular and form longitudinal rows, that are oriented parallel to the leaf axis.

Remarks. The gross morphology of Pagiophyllum is close to those of the leafy axis Brachyphyllum Brongn. (e.g. straight twigs having needles helically arranged and small leaves). Harris (1979) highlighted the difficulty to distinguish both genera and proposed that the “sole distinction of Pagiophyllum from Brachyphyllum is its longer free leaf”. He specified in the emended diagnoses of Brachyphyllum and Pagiophyllumleaf composed of a basal cushion tapering into a small free part, length of free part (upper surface beyond leaf cushion) or total height of leaf and cushion (outward from shoot) less than width of leaf cushion” for the first, whereas “leaf about as broad as its basal cushion, length exceeding width of cushion” for the second. Brachyphyllum was reported from many Cretaceous palaeobotanical sites of western France (e.g. Coquand, 1860; Gomez et al., 2008; Néraudeau et al., 2009; Moreau et al., 2014a). It differs from Pagiophyllum by its leaves that are as long as wide, with a shorter free part strongly appressed to the stem. Following Harris (1979), the specimens from Fouras can be confidently ascribed to Pagiophyllum.

4.2 Cone

Genus – Classostrobus Alvin, Spicer & J. Watson 1978

Classostrobus sp.

Figs. 1K and 1L

Material. 1 specimen; IGR.FRS-7.18

Description. Cone is ovoid, 1.7 mm long, 1.3 mm wide and bears more than 15 imbricate, helically arranged, scale-like leaves. The scale-like leaves are convex, rhomboidal in shape, and show acuminate or acute apices (Figs. 1K and 1L). They are up to 0.8 mm long and up to 0.7 mm wide.

Remarks. Inner structures of the cone are not visible. We may notice that tiny male cones ascribed to Classostrobus sp. and showing a gross morphology close to the specimen from Fouras – Bois Vert were discovered in Cenomanian lignitic clay from several areas of Charente-Maritime (e.g. Aix Island, Néraudeau et al., 2009; Puy-Puy, Perrichot, 2005). Pagiophyllum and Classostrobus often co-occur in Mesozoic plant beds (Thévenard, 1993; Van Konijnenburg-Van Cittert, 1987). However, stomatal apparatuses being not visible, the cone from Fouras – Bois Vert cannot be confidently linked with the leafy axis Pagiophyllum described below.

5 Discussion and conclusions

Albian-Cenomanian plant remains have been reported from many localities in western France (e.g. Coquand, 1860; Zeiller, 1887; Lecointre and Carpentier, 1938; Pons et al., 1976; Pons, 1979; Koeniguer, 1981; Berthelin and Pons, 1999; Néraudeau et al., 2002, 2005, 2013, 2020; Gomez et al., 2004, 2008; Coiffard et al., 2009; Saint-Martin et al., 2013; Moreau et al., 2014a, 2014b, 2015, 2017b, 2017c; Valentin et al., 2014; Fleury et al., 2017). These reports included angiosperms, conifers, bennettitaleans, ferns, cycads and ginkgophytes. Conifers are represented by leafy axes, male cones, as well as isolated ovuliferous scales. Leafy axes of Brachyphyllum, Frenelopsis (Schenk) emend. J. Watson, Geinitzia Endl., and Glenrosa J. Watson & H.L. Fisher are abundant in most of conifer-dominated assemblages from the Cretaceous deposits of Charente-Maritime (e.g. Gomez et al., 2008; Néraudeau et al., 2009; Moreau et al., 2014a, 2015, 2017c). However, the conifer Pagiophyllum is reported for the first time from this area, as it was hitherto known only from the Cenomanian deposits of the Vienne department (Valentin et al., 2014).

Conifers with xerophytic characters have already been found among the Cretaceous coastal flora of western France (e.g. Brachyphyllum, Frenelopsis, and Glenrosa; Gomez et al., 2008; Moreau et al., 2015). According to these studies, these plants were adapted to withstand intense sunlight and coastal environments exposed to desiccant conditions coupled with saline sea water, and dry conditions. Pagiophyllum clearly shows fleshy shoots, small leaves pressed against the axis, thick cuticle, and sunken stomata apparatuses with subsidiary cells forming a thick rim. These features are those of a flora in a tropical climate with contrasted seasons cyclically dry (Thévenard et al., 2003). In accordance with this hypothesis, Néraudeau et al. (2003) interpreted the amber-bearing bed from Fouras as a paralic deposit showing both marine and terrestrial imputs. Complementing previous palaeobotanical analyses (e.g., Gomez et al., 2008; Moreau et al., 2015), the xerophytic features of Pagiophyllum are new arguments to support that Albian–Cenomanian coastal floras of Charente-Maritime were well-adapted to paralic environments seasonally exposed to hot, dry conditions.

The Cretaceous flora from western France is mostly preserved as impressions and compressions with or without cuticle in clayey and lignitic deposits. By contrast with these highly compressed fossil plants, the Pagiophyllum leafy axes and the cone from the Fouras amber are preserved in three dimensions. Moreau et al. (2017a, 2017b, 2017c) demonstrated that some specimens can exquisitely preserved most of the tissues, including epidermis, palisade parenchyma, spongy parenchyma, transfusion tracheids and vascular bundles. However, the inner structures of the specimens from Fouras cannot be explored using classic light microcopy. Although we cannot ensure such preservation, future investigations using 3D imaging technique such as synchrotron tomography should be appropriate to explore the histology of these specimens from Fouras.


We thank Eric Dépré (INRA Surgères), Vincent Girard (Université de Montpellier) and Romain Vullo (Université Rennes 1) for their contributions during several field trips at Fouras. We thank the two anonymous reviewers for their constructive comments on the manuscript. This work is a contribution to the research program INSU TELLUS InterrVie, Project NOVAMBRE 2 (coord. D. Néraudeau and V. Perrichot).


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Cite this article as: Moreau J-D, Néraudeau D, Perrichot V. 2020. Conifers from the Cenomanian amber of Fouras (Charente-Maritime, western France), BSGF - Earth Sciences Bulletin 191: 16.

All Figures

thumbnail Fig. 1

Plant inclusions in Cenomanian amber from Fouras – Bois Vert. A–B. Fragment of amber bearing a conifer cone (A) and leafy axis (B); black arrow indicates location of the cone. C–H. Helically arranged conifer leafy axis, Pagiophyllum sp. I–J. Abaxial surface of a leaf showing alignment of stomatal apparatuses; black arrows indicate location of stomatal apparatuses. K–L. Cone of conifer, Classostrobus. A, K–L. IGR.FRS-7.18; B, G–H, IGR.FRS-1.14; C–D. IGR.FRS-7.25; E–F. IGR.FRS-7.10. Scale bars: A = 10 mm; B = 5 mm; C–H = 1 mm; I–L = 0.5 mm.

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