Citation:

dsdp.proc.93.116.1987

Name: (Table 1) Distribution of Lower Cretaceous calcareous nannofossils at DSDP Hole 93-603B
Published: 1987
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Upper Berriasian to lower Aptian calcareous nannofossil assemblages have been studied from a siliciclastic deep-sea fan complex and a subjacent limestone sequence drilled beneath the lower continental rise in the western North American Basin, 270 miles (435 km) off Cape Hatteras, North Carolina (USA). Sharp lithologic facies changes and reworking by turbidites complicate the biostratigraphic interpretation, but provide an excellent opportunity to better distinguish "nearshore" from open-ocean nannofossil species, and to investigate the introduction of neritic taxa into the deep-see environment, a phenomenon that appears to have been widespread within the circum-North Atlantic during Neocomian times. Well-preserved assemblages in dark, carbonaceous claystones were probably displaced from the oxygen minimum zone along the upper slope or outer shelf. Neritic, continental margin species prevalent in this facies include the holococcolith Zebrashapka vanhintei n. gen., n. sp., Lithraphidites alatus magnus n. spp., Pickelhaube furtiva n. gen., and a host of nannoconids and micrantholiths.

A qualitative evaluation of widely used guide fossils suggests that the triad of proposed markers for the base of Roth's Zone NC3 make their first appearances in the following (ascending) order: Diadorhombus rectus, TUbodiscus verenae, Calcicalathina oblongata. Of these, we chose the nominative species for the zone, T. verenae, to mark its base and to approximate the Berriasian/Valangian boundary. Cyclagelosphaera deflandrei is strongly affected by diagenesis and is therefore not a reliable index species for the base of Zone NC4 near the Valanginian/Hauterivian boundary (the last occurrence of T. verenae is also not suitable there). In addition, Lithraphidites bollii, a form apparently confined to the low latitudes of the Tethyan region, was absent at the more temperate Site 603 and not available as a subzonal marker for the upper Hautervian-lower Barremian (mid-NC4 and mid-NC5, respectively). Cruciellipsis cuvillieri, however, provides a reliable datum just below the Hauterivian/Barremian boundary (base of NC5), despite the potential for reworking in this section. Nannoconids tend to be reworked in this section, and do not provide trustworthy forms to mark the Barremian/Aptian boundary (base of NC6). Hayesites irregularis n. comb, probably does provide a useful first appearance datum within the lower Aptian, if it is not confused with a more birefringent and globular form, Rucinolithus terebrodentarius n. sp. Rhagodiscus angustus is mimicked by a similar form (Zeughrabdotusl pseudoangustus n. sp.), which apparently ranges down to the Hauterivian, thus Lithastrinus floralis provides a more useful first appearance datum for the base of the middle-upper Aptian Rhagodiscus angustus Zone (NC7).

Aside from the new taxa mentioned above, the following are also described: Cretarhabdusl delicatus n. sp. and Cyclagelosphaera jiangii n. sp.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: 35.495200 * Longitude: -70.028500

Date/Time Start: 1983-05-05T00:00:00 * Date/Time End: 1983-05-05T00:00:00

Minimum DEPTH, sediment/rock: 1214.6 m * Maximum DEPTH, sediment/rock: 1573.7 m

Event(s):

93-603B * Latitude: 35.495200 * Longitude: -70.028500 * Date/Time: 1983-05-05T00:00:00 * Elevation: -4633.0 m * Penetration: 1576.2 m * Recovery: 485.6 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 74 cores; 674.6 m cored; 0 m drilled; 72 % recovery

Comment:

Sediment depth is given in mbsf. 93-603B-44-1,18-19 and 93-603B-44-4,7-8 samples barren. V = very abundant, A = abundant, C = common, R = rare, #R = SEM only, G = good, M = moderate, P = poor.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Covington, J Mitchener	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	Lithologic unit/sequence	Unit		Covington, J Mitchener
4	Stage	Stage		Covington, J Mitchener
5	Nannofossil zone	Nannos zone		Covington, J Mitchener
6	Lithology/composition/facies	Lithology		Covington, J Mitchener	Visual description
7	Nannofossil abundance	Nannos abund		Covington, J Mitchener	Smear slide analysis
8	Nannofossils preservation	Nannos preserv		Covington, J Mitchener	Smear slide analysis
9	Assipetra infracretacea	A. infracretacea		Covington, J Mitchener	Smear slide analysis	Including Rucinolithus terebrodentarius
10	Axopodorhabdus dietzmannii	A. dietzmannii		Covington, J Mitchener	Smear slide analysis
11	Biscutum sp.	Biscutum sp.		Covington, J Mitchener	Smear slide analysis
12	Braarudosphaera discula	B. discula		Covington, J Mitchener	Smear slide analysis
13	Braarudosphaera regularis	B. regularis		Covington, J Mitchener	Smear slide analysis
14	Calcicalathina oblongata	C. oblongata		Covington, J Mitchener	Smear slide analysis
15	Chiastozygus litterarius	C. litterarius		Covington, J Mitchener	Smear slide analysis
16	Chiastozygus striatus	C. striatus		Covington, J Mitchener	Smear slide analysis
17	Chiastozygus tenuis	C. tenuis		Covington, J Mitchener	Smear slide analysis
18	Conusphaera mexicana	C. mexicana		Covington, J Mitchener	Smear slide analysis
19	Corollithion achylosum	C. achylosum		Covington, J Mitchener	Smear slide analysis
20	Corollithion acutum	C. acutum		Covington, J Mitchener	Smear slide analysis
21	Corollithion ellipticum	C. ellipticum		Covington, J Mitchener	Smear slide analysis
22	Corollithion conicus	C. conicus		Covington, J Mitchener	Smear slide analysis	Including C. surirellus
23	Cretarhabdus crenulatus	C. crenulatus		Covington, J Mitchener	Smear slide analysis
24	Cretarhabdus sp.	Cretarhabdus sp.		Covington, J Mitchener	Smear slide analysis	sp. cf. C. multiformis
25	Cruciellipsis cuvillieri	C. cuvillieri		Covington, J Mitchener	Smear slide analysis
26	Cruciplacolithus hayi	C. hayi		Covington, J Mitchener	Smear slide analysis
27	Cyclagelosphaera deflandrei	C. deflandrei		Covington, J Mitchener	Smear slide analysis
28	Cyclagelosphaera margerelii	C. margerelii		Covington, J Mitchener	Smear slide analysis
29	Diadorhombus rectus	D. rectus		Covington, J Mitchener	Smear slide analysis
30	Diazomatolithus lehmanii	D. lehmanii		Covington, J Mitchener	Smear slide analysis
31	Diloma placinum	D. placinum		Covington, J Mitchener	Smear slide analysis
32	Diloma primitivum	D. primitivum		Covington, J Mitchener	Smear slide analysis
33	Discorhabdus biradiatus	D. biradiatus		Covington, J Mitchener	Smear slide analysis
34	Discorhabdus ignotus	D. ignotus		Covington, J Mitchener	Smear slide analysis
35	Eiffellithus sp.	Eiffellithus sp.		Covington, J Mitchener	Smear slide analysis	#1
36	Eiffellithus sp.	Eiffellithus sp.		Covington, J Mitchener	Smear slide analysis	#2
37	Ethmorhabdus hauterivianus	E. hauterivianus		Covington, J Mitchener	Smear slide analysis
38	Glaukolithus diplogrammus	G. diplogrammus		Covington, J Mitchener	Smear slide analysis
39	Grantarhabdus coronadventis	G. coronadventis		Covington, J Mitchener	Smear slide analysis
40	Grantarhabdus meddii	G. meddii		Covington, J Mitchener	Smear slide analysis
41	Haqius circumradiatus	H. circumradiatus		Covington, J Mitchener	Smear slide analysis
42	Hayesites irregularis	H. irregularis		Covington, J Mitchener	Smear slide analysis
43	Lithraphidites alatus ssp. magnus	L. alatus ssp. magnu		Covington, J Mitchener	Smear slide analysis
44	Lithraphidites carniolensis	L. carniolensis		Covington, J Mitchener	Smear slide analysis
45	Manivitella sp.	Manivitella sp.		Covington, J Mitchener	Smear slide analysis	sp.cf. M. pecten
46	Manivitella pemmatoidea	M. pemmatoidea		Covington, J Mitchener	Smear slide analysis
47	Micrantholithus hoschulzii	M. hoschulzii		Covington, J Mitchener	Smear slide analysis
48	Micrantholithus obtusus	M. obtusus		Covington, J Mitchener	Smear slide analysis
49	Micrantholithus sp.	Micrantholithus sp.		Covington, J Mitchener	Smear slide analysis	#1
50	Microstaurus chiastius	M. chiastius		Covington, J Mitchener	Smear slide analysis
51	Microstaurus conus	M. conus		Covington, J Mitchener	Smear slide analysis
52	Nannoconus colomii	N. colomii		Covington, J Mitchener	Smear slide analysis
53	Nannoconus dolomiticus	N. dolomiticus		Covington, J Mitchener	Smear slide analysis
54	Nannoconus globulus	N. globulus		Covington, J Mitchener	Smear slide analysis
55	Nannoconus grandis	N. grandis		Covington, J Mitchener	Smear slide analysis
56	Nannoconus sp.	Nannoconus sp.		Covington, J Mitchener	Smear slide analysis	sp.cf. N. kamptneri
57	Nannoconus steinmannii	N. steinmannii		Covington, J Mitchener	Smear slide analysis
58	Nannoconus spp.	Nannoconus spp.		Covington, J Mitchener	Smear slide analysis	other
59	Octopodorhabdus plethotretus	O. plethotretus		Covington, J Mitchener	Smear slide analysis
60	Percivalia fenestrata	P. fenestrata		Covington, J Mitchener	Smear slide analysis
61	Pickelhaube furtiva	P. furtiva		Covington, J Mitchener	Smear slide analysis
62	Reinhardtites sp.	Reinhardtites sp.		Covington, J Mitchener	Smear slide analysis	sp. cf. R. elegans
63	Rhabdolekiskus parallelus	R. parallelus		Covington, J Mitchener	Smear slide analysis
64	Rhagodiscus asper	R. asper		Covington, J Mitchener	Smear slide analysis	Including R. splendens
65	Rhagodiscus infinitus	R. infinitus		Covington, J Mitchener	Smear slide analysis
66	Rhagodiscus swinnertonii	R. swinnertonii		Covington, J Mitchener	Smear slide analysis
67	Rucinolithus wisei	R. wisei		Covington, J Mitchener	Smear slide analysis
68	Speetonia colligata	S. colligata		Covington, J Mitchener	Smear slide analysis
69	Stephanolithion laffittei	S. laffittei		Covington, J Mitchener	Smear slide analysis
70	Tegumentum stradneri	T. stradneri		Covington, J Mitchener	Smear slide analysis
71	Tetrapodorhabdus coptensis	T. coptensis		Covington, J Mitchener	Smear slide analysis
72	Tubodiscus verenae	T. verenae		Covington, J Mitchener	Smear slide analysis
73	Tubodiscus sp.	Tubodiscus sp.		Covington, J Mitchener	Smear slide analysis	#1
74	Vekshinella stradneri	V. stradneri		Covington, J Mitchener	Smear slide analysis
75	Watznaueria barnesae	W. barnesae		Covington, J Mitchener	Smear slide analysis
76	Watznaueria biporta	W. biporta		Covington, J Mitchener	Smear slide analysis
77	Watznaueria britannica	W. britannica		Covington, J Mitchener	Smear slide analysis
78	Zeugrhabdotus embergeri	Z. embergeri		Covington, J Mitchener	Smear slide analysis
79	Zeugrhabdotus erectus	Z. erectus		Covington, J Mitchener	Smear slide analysis
80	Zeugrhabdotus pseudoangustus	Z. pseudoangustus		Covington, J Mitchener	Smear slide analysis	?
81	Zebrashapka vanhintei	Z. vanhintei		Covington, J Mitchener	Smear slide analysis

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

5040 data points

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