◄ Carnets Geol. 22 (21) ►
[1. Introduction] [2. Methods] [3. Systematic paleontology]
[4. Associated LBF, ages, and paleoenvironments] and ... [Bibliographic references]
Department of Geography & Geology, The University of the West Indies, Mona, Kingston 7 (Jamaica, W.I.)
U.S. Geological Survey, 3321 College Avenue, Fort Lauderdale, FL 33314 (USA)
Published online in final form (pdf) on December 25, 2022
[Editor: Simon F. Mitchell; technical editor: Bruno R.C. Granier]
We describe two larger benthic foraminiferal taxa collected from wells drilled in the subsurface Eocene rocks of southeastern Florida that are new to peninsular Florida and the Caribbean region. Saudia floridana n.sp. is characteristic of a foraminiferal assemblage, along with Helicostegina gyralis, wide forms of the Cushmania americana group, and Gunteria floridana, in an upper part of the Oldsmar Formation. Globogypsinoides browardensis n.gen. n.sp. occurs in a second foraminiferal assemblage, along with Borelis cf. floridanus, Coskinolina cf. yucatanensis, and as-yet undescribed large rotaliids, in a middle part of the Oldsmar Formation. The foraminiferal assemblage of the middle Oldsmar unit is ascribed an Ypresian age and the assemblage of the upper Oldsmar unit a Lutetian age. These two assemblages indicate inner shelf water depths of 40 m or less on the Florida Platform during the Early to Middle Eocene deposition of the middle to upper part of the Oldsmar Formation.
• larger benthic foraminifera;
• Oldsmar Formation
Robinson E. & Cunningham K.J. (2022).- New larger benthic foraminifera from the subsurface Lower to Middle Eocene Oldsmar Formation of southeastern Florida (USA).- Carnets Geol., Madrid, vol. 22, no. 21, p. 857-865.
Nouveaux grands foraminifères benthiques de la Formation d'Oldsmar (Éocène inférieur à moyen) du sud-est de la Floride (États-Unis d'Amérique).- Nous décrivons ici deux taxons de grands foraminifères benthiques provenant de puits forés dans les couches éocènes du sud-est de la Floride. Il s'agit d'espèces nouvelles pour la Floride péninsulaire et la région caribéenne. Saudia floridana n.sp. est caractéristique d'une association de foraminifères de la partie supérieure de la Formation d'Oldsmar, comprenant également Helicostegina gyralis, de grandes formes du groupe Cushmania americana, et Gunteria floridana. Globogypsinoides browardensis n.gen. n.sp. apparaît dans une seconde association de foraminifères de la partie médiane de la Formation d'Oldsmar, accompagnée de Borelis cf. floridanus, Coskinolina cf. yucatanensis et de grands rotaliidés non encore décrits à ce jour. Un âge yprésien est attribué à l'association de foraminifères de l'unité médiane d'Oldsmar et un âge lutétien à celle de l'unité supérieure d'Oldsmar. Ces deux associations indiquent des bathymétries de -40 m ou moins pour la partie interne de la plate-forme de Floride pendant le dépôt des couches de l'Éocène inférieur à moyen des parties moyenne à supérieure de la Formation Oldsmar.
• grands foraminifères benthiques ;
• Éocène ;
• Floride ;
• Formation Oldsmar
The Paleogene carbonate rocks of peninsular Florida contain varied assemblages of larger benthic foraminifera (LBF) which are detailed in several local and regional studies, particularly since the mid-20th Century (e.g., Cole, 1938, 1941, 1942; E.R. Applin & Jordan, 1945; Levin, 1957; Bowen-Powell, 2010; Cotton et al., 2018). These rocks form the northernmost component of a much larger Caribbean and Central American faunal province extending into the offshore areas of northern South America (Barker & Grimsdale, 1936; Vaughan, 1945; Frost & Langenheim, 1974; Wong, 1976; Butterlin, 1981, 1990; Robinson & Wright, 1993; Caudri,1996; Serra-Kiel et al., 2007; BouDagher-Fadel & Price, 2010; Vicedo et al., 2014; Torres-Silva et al., 2019; Mitchell et al., 2022). The Eocene LBF assemblages, although diverse, show marked differences from the LBF zonation established by the Shallow Benthic Zone (SBZ) scheme of Serra-Kiel et al. (1998 and references therein) for the Tethys region. The large nummulitids, which historically have formed the backbone of Tethys biostratigraphy, are mostly absent from the Western Hemisphere, apart from a few isolated monospecific occurrences in the northern Caribbean (Rutten, 1935; Robinson & Wright, 1993; Mitchell et al., 2022). The principal taxa of much of the Floridan, Caribbean and northern South American Eocene assemblages are dominated by the Lepidocyclinidae that are amenable to forming the basis of a LBF zonation parallel to SBZ zonation of the Tethys region (Mitchell et al., 2022). As part of an ongoing subsurface stratigraphic study in southeast Florida (Cunningham, 2015; Cunningham & Robinson, 2017; Cunningham et al., 2018a, 2018b), we describe two Eocene LBF that appear to be related to Tethys groups but have not been previously reported from the Western Hemisphere. They occur in several wells drilled in the southeastern part of peninsular Florida (Fig. 1 ), in the Lower to lower Middle Eocene Oldsmar Formation (P.L. Applin & E.R. Applin, 1944; Levin, 1957; Cunningham et al., 2018b).
Geographical location of study area. 1, Regional map showing location of study area. 2, General map showing location of 7 wells sampled for foraminiferal specimens.
The material for the study consisted of thin sections of samples taken, either as cuttings or cores from several wells in Southeast Florida, as listed for each taxon in the Systematic section. The thin sections were prepared primarily for sedimentological studies (Cunningham, 2015; Cunningham et al., 2018a, 2018b) and the LBF specimens examined for the present paper occurred in these as thin sections that in many cases were not acquired specifically for LBF study. Standard transmitted-light petrography was used to examine thin sections containing specimens. Measurements of the dimensions of specimens were completed and images acquired using a trinocular Amscope T120C microscope with an eyepiece micrometer and MU1000 digital camera.
Suprageneric classification follows Kaminski, 2014.
Order Loftusiida Kaminski & Mikhalevich, 2004
Superfamily Loftusoidea Brady, 1884
Family Spirocyclinidae Munier-Chalmas, 1887
Genus Saudia Henson, 1948
Type species: Saudia discoidea Henson, 1948
Saudia discoidea Henson, 1948
1948 Henson, p. 97-98; Pl. XII, figs. 1-4 (paratypes), 5.
Remarks: Saudia discoidea was described and named by Henson (1948) for a species of spirocyclinid collected on the Saudi Arabian border, from localities reported (in his text) to be "in Lower Eocene limestones with Dictyoconus sp." (Henson, 1948, p. 98) It was designated the type species for the monotypic genus Saudia, described as having cyclical chambers with a complex exoskeleton consisting of several orders of beams and rafters forming a cellular structure, diagrammatically illustrated by Henson (1948) in his Figure 14. The published illustrations consisted of two subequatorial sections of flabelliform (reniform) microspheric (B-form) paratypes; (Henson, 1948, Pl. XII, figs. 1-2) and three axial sections of fragments of the annular chambers, two of which were designated as paratypes, captioned as being "Lutetian" (Henson, 1948, Pl. XII, figs. 3-5). The holotype was not illustrated. We cannot confirm which, if either, of the two ages quoted by Henson above for his types is correct.
As Drobne and Hottinger (1971) aptly remarked in their redescription of Saudia (translated from the German): "The photographic documentation for the description is so modest that you have to rely on the drawing interpretation of the structure as the basis for the generic definition".
In the present paper, we illustrate the holotype of Saudia discoidea for the first time (Fig. 2 ). As is evident from the illustrations, the holotype has been extensively affected by diagenesis but is an example of a reniform, possibly discoidal, megalospheric (A-form) individual. In referring our species to the genus Saudia, we follow Drobne and Hottinger (1971) in placing emphasis on Henson's written generic description (Henson, 1948, p. 97) and his Figure 14 (ibid., p. 98).
Saudia discoidea Henson, 1948, Holotype. NHMUK PM P36023. 1, Subequatorial (top) view; 2, side view. Accompanying scale bar is 0.5 mm for both 1 and 2. The holotype was not illustrated along with
Henson's (1948) original published description. Photographs, including scale bar, by Dr. Stephen Stukins, senior curator, Natural History Museum, London and courtesy of the Trustees of the Natural History Museum, London.
Saudia floridana n.sp.
2018b Thomasella cf. T. labyrinthica (Grimsdale); Cunningham et al., text in Figs. 3, 10; Thomasella n.sp. Table 3.
Material: Numerous incomplete specimens in thin sections cut from cores and cuttings from wells FTL-I4, G-2994, G-2944, G-3805, G-3973, and SDIW-20 (Fig. 1 ).
Description: The large reniform (discoidal?) agglutinated test is bilaterally symmetrical with specimens varying from slightly to distinctly biconcave with a central swelling. The test margin is rounded. The species is strongly dimorphic. Two centred axial specimens of the megalospheric generation have diameters of 9.6 and 8.8 mm (Fig. 3.4-3.5 ), while a single equatorial section has a diameter of 7 mm (Fig. 3.1 ). On megalospheric specimens the polar region is inflated with examples reaching a thickness of about 1.3 mm over the embryonic region at the pole, 0.8 to 0.9 mm over the first annular chambers and 0.8 to 1.2 mm at the test margin. The complete subaxial section of a microspheric (B form) individual has a diameter of 27 mm (Fig. 4.4 ), a thickness over the polar region of 0.6 mm, and of 2.0 to 2.2 mm at the periphery. Other microspheric specimens exceed 20 mm in equatorial diameter, based on radius and partial diameter measurements.
The nuclear zone in the A form generation is poorly preserved in the specimens available (Fig. 3.1-3.5 ). It is irregularly subspherical with a polar diameter of 0.9 to 1.1 mm and an equatorial diameter of 1.0 to 1.5 mm. It consists of an inner, oblate spheroidal chamber (sphaeroconch of Hottinger, 1967, and Drobne and Hottinger, 1971) with an approximate ratio equatorial diameter/height of 1.1 to 1.2, pierced by multiple foramina (Fig. 3.2-3.3 ) averaging 0.04 to 0.05 mm in diameter and uniformly distributed over its surface, embraced by an outer chamber or chambers divided by radial pillars or partitions that appear to support the sphaeroconch (Fig. 3.2 ). The embryon is succeeded by 1-2 reniform or spiral chambers, then by annular chambers. The character of the embryonic region of the B generation was not determined.
The nuclear zone is surrounded by up to 40 annular chambers in the megalospheric test with an average length of 0.13-0.14 mm. About 66 chambers were counted for the microspheric example, with an average length of 0.19 mm. Each chamber is divided into a central or endoskeletal zone containing interseptal pillars, separated above and below by narrow spaces (the "open zones" of Grimsdale, 1952, p. 231) from a marginal exoskeleton of beams and rafters. The radially directed interseptal pillars of the endoskeleton are close to continuous from chamber to chamber (Figs. 3.1 , 4.1 ), increasing distally from one to two, rarely three tiers, resembling the axial fragment illustrated by Henson (1948, Pl. XII, fig. 4), alternating in position with one or more rows of stolons (Fig. 4.3 ). The open zones, about 0.05 mm high, are free of skeletal elements except for the chamber septa, which are pierced by multiple, radially directed foramina about 0.18 mm apart and with diameters of about 0.05 to 0.07 mm (Fig. 4.1 ). Each marginal exoskeletal zone consists of a subepidermal network of radial beams and concentric rafters. These increase in number towards the marginal wall. On tangential cuts, the test surface resembles a honeycomb-like meshwork of cellules, like that described by Grimsdale (1952, p. 231, Pl. 21, fig. 3) for his Saudia labyrinthica, and structurally like those seen on the conical genus Cushmania (e.g., Robinson, 1974, Fig. 3). There are at least two orders of beams (Fig. 4.1 ). The primary beams are the most prominent element of the exoskeleton and alternate from chamber to chamber as in S. labyrinthica (Grimsdale, 1952) initially about 0.08 to 0.09 mm thick and spaced 0.17 to 0.18 mm apart (Fig. 4.2 ). Near the thinner margin, second- and third-order beams are inserted, together with much thinner rafters, so that at the margin the number of cellules may reach as high as 6 to 7 across the chamber length (Fig. 4.2 ).
Figure 3: Saudia floridana
n.sp. 1, Equatorial section, designated as holotype, showing the central nuclear region surrounded by annular chambers and radially directed interseptal pillars, exoskeletal zone of beams and rafters visible around the periphery of the test, and rectangular area at upper left is enlarged on
Fig. 4 . 2, Enlargement of nuclear region of 4 showing stolons through the sphaeroconch
(ps) and pillars/septa of the embracing chamber. 3, Enlargement of nuclear region of 1 to show sphaeroconcal stolons
(ps). 4-5, Axial sections through megalospheric specimens, designated paratypes, showing interseptal pillars
(ip). Scale bars shown on each of 1-3; 2 mm scale bar for 4 and 5. See text and
for well locations and depths.
4: Saudia floridana n.sp. 1, part of the holotype at Fig. 3.1
(rectangular area) enlarged to show endo and exoskeletal detail and the agglutinated, particulate nature of the test. 2, Part of a specimen from well FTL-I4 at 2345 ft (714.8 m) showing distribution of cellules in the outermost part of the exoskeleton. 3, Tangential section of a specimen from well G-2994 at 2623.36 ft (799.6 m) showing apertures and cross-sections through interseptal pillars. 4, Subaxial section through a microspheric individual from well FTL-I4 at 2358.40 ft (718.8 m). Annotations: a, apertures; c, cellules;
ip, interseptal pillars in the endoskeleton; m, test margin; oz, "open zone" of Grimsdale,
1952, lacking interseptal pillars; and
pb, primary beams. 1 mm scale bar for 1-3; 5 mm scale bar for 4. See Figure 1
for well locations.
Remarks: Saudia floridana n.sp. is distinguished from other complex discoidal LBF in the Florida Paleogene (E.R. Applin & Jordan, 1945, p. 141) by three features in the ultrastructure: (1) the agglutinated, particulate nature of the wall (Figs. 3 - 4 ); (2) the complex irregular cellular structure of the wall, seen in Paleogene and Mesozoic spirocyclinids (Hottinger, 1967) and many of the conical dictyoconids, such as Cushmania; and (3) the more complex prolocular region (sphaeroconch). These features are not present in the porcelaneous peneroplid group (ER observations; Loeblich & Tappan, 1987). It is likely that fragmental S. floridana has been confused with fragments of wide forms of the Cushmania americana group in the past as these are common at the same stratigraphic level as S. floridana (E.R. Applin and Jordan, 1945, p. 136). Compare the sketch of Figure 2 in E.R. Applin and Jordan (1945) with the exoskeletal structure visible in images 1 and 2 of our Figure 4 ). Grimsdale (1952, p. 231) emphasized, in his well-illustrated description, that his Saudia labyrinthica was differentiated from Saudia discoidea solely by the extreme complexity of the endoskeleton. Sirel (1998) also emphasized the greater complexity of the exoskeleton of S. labyrinthica to support the type for his new genus Thomasella. Because Henson (1948) had described the exoskeleton of S. discoidea as being complex, with multiple beams and rafters, the types of Saudia Henson and Thomasella Sirel (1998) were examined by the first author (E.R.) at the Natural History Museum, United Kingdom. The details of the published type specimens of S. discoidea are difficult to evaluate due to diagenetic influences. None appear to display more than two orders of beams in the exoskeleton, but possible further multiplication is obscured by rock matrix.
Differences from other species: Saudia floridana n.sp. has similar exoskeletal features as seen in Saudia labyrinthica but differs in the absence of the labyrinthic structural complexity and the less prominent open zone. It resembles Saudia discoidea in the relative simplicity of the endoskeleton with scattered interseptal pillars, the relatively narrow open zone and a test with less pronounced biconcavity. The size of the sphaeroconch is about the same. The B-form of S. floridana (Fig. 4.4 ) is much larger than those illustrated for S. discoidea.
The specimen in Figure 3.1 , designated as the holotype, is from a core from well FTL-I4 at 2,297.25 ft (700.2 m) depth. Paratypes (Fig. 3.4-3.5 ) are from the FTL-I4 core at 2,296.70 ft (700.0 m) and well G-3973 core at 2,564.80 ft (781.8 m), respectively. The microspheric specimen (Fig. 4.4 ) is from a core from well FTL-I4 at 2,358.40 ft (718.8 m). See Figure 1 for well locations.
Depository: The type specimens, along with other reference specimens will be deposited in the collections of the U.S. National Museum, Washington - DC.
Family Acervulinidae Schultze, 1854
Genus Globogypsinoides n.gen.
Type species: Globogypsinoides browardensis n.gen. n.sp.
Diagnosis: A small globular acervulinid with a central proloculus followed by a short nepionic coil of arcuate chambers, succeeded in the adult stage by one or more series of streptospirally arranged orbitoidiform chambers.
Although the overall architecture bears a close resemblance to the genus Orduella Sirel, 1999, we do not include Globogypsinoides n.gen. in that genus, nor in the family Orduellidae Sirel, because the nepionic chambers are distinctly arcuate, not subrectangular, at least in the megalospheric generation. For this reason and until more material becomes available for examination, we retain Globogypsinoides in the Acervulinidae. The genus differs from the globular genus Sphaerogypsina Galloway, 1933, in possessing a multiple spiral development of orbitoid-like chambers whereas the chambers in Sphaerogypsina develop in a radial pattern. The new genus differs from Protogypsina Matsumaru & Sarma, 2010, in the test shape, which is consistently globular, and in the size and arrangement of the nepionic coiling.
Globogypsinoides browardensis n.sp.
2018b Orduella cf. O. sphaerica Sirel; Cunningham et al., Figs. 3, 10,Table 3
Material: About 60 specimens in thin sections from wells G2994, G3805 and G3973 (Fig. 1 ) are available.
Description: The sub-globular tests are small, with mostly off-centred sections of megalospheric specimens ranging in diameter from about 0.2-0.5 mm. The largest centred megalospheric specimens are 0.51 and 0.52 mm in diameter. Centered megalospheric tests have proloculi ranging in diameter from about 0.05 up to 0.08 mm. The initial chambers are followed by two to three whorls of spirally arranged arcuate chambers then by arcuate (orbitoidiform?) chambers arranged in multiple streptospires to form the globular test. The species is dimorphic, and the microspheric form is rare. No centred microspheric tests were encountered. Figure 5.2 shows a near-centered, probable microspheric form but the preservation is poor. The largest uncentred, presumed microspheric specimen has a diameter of 1.7 mm (Fig. 5.3 ).
The individual in Figure 5.6 , designated as holotype, is from well G-2994 at 2,936.7 ft (895.1 m). Individuals in Figure 5.3-5.4, 5.7, 5.12 are designated as paratypes from well G-3973 at 2,622.82 ft (799.4 m), G-3973 at 2,621.25 ft (799.0 m), well G3805 at 2,734.3ft (833.4 m), and well G-2994 at 2,938.9 ft (895.8 m), respectively. See Figure 1 for well locations.
Depository: The type specimens, along with other reference specimens will be deposited in the collections of the U.S. National Museum, Washington - DC.
5: 1-12, Globogypsinoides browardensis n.gen. n.sp. Random sections through twelve
specimens. 1-3 are probable microspheric specimens and 4-12 are megalospheric specimens. Location and depths for 6, the holotype, and
3-4, 7 and 12, paratypes, are given in the text. 1-2, 5, 8 are from well G-3805 at a depth of 2,732.7 ft (832.9 m), well G-2994 at 2,930.3 ft (893.2 m), well G3805 at 2,737.8 ft (834.5 m) and from well G-3973 at a depth of 2,780.3ft (847.4 m) respectively. 9-12 are from well G2994 at depths of 2,930.3 ft (893.2 m), 2,938.9 ft (895.8 m), 2,934.2 ft (894.3 m) and 2,938.9 ft (895.8 m) respectively. The 0.5 mm scale is for 1; 1 mm scale for 3; and 0.2 mm scale for 2, 4-12. See
for well locations.
This is the first report of Saudia sp. from peninsular Florida and the Caribbean region. In southeastern Florida
Globogypsinoides browardensis n.gen. n.sp. is a member of a foraminiferal assemblage within a middle part of the Oldsmar Formation in wells G2994, G3805, and G3973 (Fig. 1 ), accompanied by Coskinolina cf. yucatanensis (Vicedo et al., 2014), and by large species of undescribed rotaliids, including the form called Rotalia trochidiformis of Levin (1957), and in wells G-3805 and G-3973 (Fig. 1 ) also by Borelis cf. floridanus Cole, 1941. The latter is a species usually considered to be a Cedar Keys Formation marker of Paleocene age but also reported by Levin (1957) in the Oldsmar Formation in his Zone IV. We assign an Early Eocene (Ypresian) age to the foraminiferal assemblage of the middle part of the Oldsmar Formation.
In all seven southeastern Florida wells (Fig. 1 ), conical agglutinated taxa dominate the two foraminiferal assemblages in the middle and upper parts of the Oldsmar Formation. In contrast, there is a lack of orbitoidal genera and nummulitids. These observations indicate that inner shelf water depths of 40 m or less (Hottinger, 1997) were the rule during the Early and Middle Eocene deposition of the middle to upper part of the Oldsmar Formation in our study area of the southeastern Florida peninsula.
Saudia floridana n.sp. and Globogypsinoides browardensis n.gen. n.sp. are important members of foraminiferal assemblages in the Oldsmar Formation with occurrences in the upper part and middle part, respectively. The recongition of Saudia in Florida, could be useful in extending biostratigraphic correlations beyond southeastern Florida and other areas of the Caribbean where LBF assemblages characteristic of very shallow water paleoenvironments lack nummulitid and orbitoidal components.
The Miami-Dade Water and Sewer Department, U.S. Geological Survey, and Broward County Environmental Planning and Community Resilience Division provided the funding for this study. The type collections of Saudia and Thomasella were made available for study in April 2018 through the courtesy of Dr. Stephen Stukins, Natural History Museum, UK, who also provided images of the holotype of Saudia discoidea Henson. Prior to journal submission, Pamela Hallock and Viviana Diaz provided reviews that improved the manuscript. Richard Westcott assisted with preparation of Figure 1 . We thank Ercan Özcan and one other anonymous reviewer for their comments on the initial manuscript submitted.
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