Citation:

PANGAEA.913333

Name: Cross bar angle analysis of 50 specimen from Eiffellithus coccolith from sedeiment core TDP-31
Published: 2020-01-24
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Biometry; biostratigraphy; Calcareous nannofossils; Eiffellithus eximius; Taxonomy

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Abstract:

The evolution of the calcareous nannofossil E. turriseiffelii - E. eximius lineage in the Turonian from the western tropical Atlantic and Indian Ocean indicates identical eiffellithid forms with morphological change in the rotation of the crossbar, relative to the longitudinal axis, from an "x" (E. turriseiffelii) to a "+" (E. eximius). Within these indistinguishable eiffellithid assemblages, neither the size nor shape show significant change during the morphological transition of the crossbar orientation. The rotation of the crossbar toward an axial alignment results in two shifts in the mean angle values. Prior to the first shift, the mean angles of the eiffellithid assemblage have values between 35o and 45o with no forms with crossbar angles of <20o. The first step occurs at the appearance of specimens with crossbar angles between 20o and 10o marking the first appearance datum (FAD) of E. eximius s. Ver. The second shift is a significant change in the mean angle values from 35-45o to 15-22o among the Eiffellithus assemblage and the appearance of morphotypes with crossbar angles of <10o recognized as E. eximius s.s. The results of this biometric study indicate that two forms can be reliably recognized and used to increase the biostratigraphic resolution, with the FAD of E. eximius s. Verbeek near the middle to upper Turonian boundary and E. eximius s.s. near the lower to middle Turonian boundary.

Keyword(s):

Biometry; biostratigraphy; Calcareous nannofossils; Eiffellithus eximius; Taxonomy

Related to:

Huber, Brian T; Petrizzo, Maria Rose; Watkins, David K; Haynes, Shannon J; MacLeod, Kenneth G (2017): Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy. Newsletters on Stratigraphy, 50(2), 141-185, https://doi.org/10.1127/nos/2017/0373

ODP Leg 207 Shipboard Scientific Party (2004): Site 1260. In: Erbacher, J.; Mosher, D.C.; Malone, M.J.; et al. (eds.), Proceedings of the Ocean Drilling Program, 207 Initial Reports, Proceedings of the Ocean Drilling Program, 207, Ocean Drilling Program, https://doi.org/10.2973/odp.proc.ir.207.107.2004

Coverage:

Latitude: -10.031389 * Longitude: 39.646667

Minimum DEPTH, sediment/rock: 5.05 m * Maximum DEPTH, sediment/rock: 114.59 m

Event(s):

TDP-31 * Latitude: -10.031389 * Longitude: 39.646667 * Elevation: -67.0 m * Recovery: 115 m * Method/Device: Gravity corer (GC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Sample ID	Sample ID		Gaer, Bradi T
2	DEPTH, sediment/rock	Depth sed	m	Gaer, Bradi T	Geocode
3	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 1
4	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 2
5	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 3
6	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 4
7	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 5
8	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 6
9	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 7
10	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 8
11	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 9
12	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 10
13	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 11
14	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 12
15	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 13
16	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 14
17	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 15
18	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 16
19	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 17
20	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 18
21	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 19
22	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 20
23	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 21
24	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 22
25	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 23
26	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 24
27	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 25
28	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 26
29	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 27
30	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 28
31	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 29
32	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 30
33	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 31
34	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 32
35	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 33
36	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 34
37	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 35
38	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 36
39	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 37
40	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 38
41	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 39
42	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 40
43	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 41
44	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 42
45	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 43
46	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 44
47	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 45
48	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 46
49	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 47
50	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 48
51	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 49
52	Eiffellithus sp., cross bar angle	Eiffellithus sp. c b angle	deg	Gaer, Bradi T	Specimen 50

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

3315 data points

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