|
Sample depth
|
Stage
|
Zone
|
Stratigraphic correlation
|
Paleoecology
|
Palynological recovery
|
Diagnostic palynomorphs,
pollen, and spores |
Biozone/stage
|
Discussion
|
|
|---|---|---|---|---|---|---|---|---|---|
|
(ft)
|
(m)
|
||||||||
| 137.5 | 41.9 | Late Turonian |
V
|
Magothy Formation–South Amboy Fire Clay Member |
Nonmarine
|
Good
|
Complexipollis exigua Christopher | V | Diagnostic angiosperms make up a small part of the total microflora. The palynological assemblage is dominated by spores of the Sphagnaceae, Pinaceae and Bryophyta. Advanced Normapolles of the Magothy are absent. Typical Normapolles of the South Amboy Fire Clay are represented by such forms as Complexipollis sp. C and Complexipollis exigua and Porocolpopollenites sp. |
| Complexipollis sp. C Doyle and Robbins, 1975 | IV-V | ||||||||
| Complexipollis sp. v Christopher | V | ||||||||
| Nyssapollenites spp. Wolf & Pakiser | V | ||||||||
| Porocolpopollenites sp. Doyle and Robbins, 1975 | V | ||||||||
| Tricolporopollenites sp. C Doyle and Robbins, 1975 |
V
|
||||||||
|
|
|
|
|
|
|
|
|
|
|
| 157.0 | 47.9 | Early Cenomanian |
III
|
Uppermost Patapsco: Elkneck Beds of Maryland |
Nonmarine
|
Very good
|
Granulatisporites dailyi |
Zone IIC and III
|
The most common angiosperms in this sample are the pollen of Tricolporoidites sp. A Doyle and Robbins, 1975, which is restricted to Zone III. Tricolporopollenites sp. B is also restricted to Zone III. Many of the spores found in this sample are typically found throughout the Potomac Group. |
|
|
|
|
|
|
|
|
Rugubivesiculites reductus |
II-Maestrichtian
|
|
|
|
|
|
|
|
|
|
Rugubivesiculites rugosus |
IIC-III
|
|
|
|
|
|
|
|
|
|
Taurocusporites spackmani Brenner, 1962 |
IIB2-III
|
|
|
|
|
|
|
|
|
|
Tricolporopollenites sp. B Doyle and Robbins, 1975 |
III
|
|
|
|
|
|
|
|
|
|
Tricolporoidites subtilliz |
IIC-III
|
|
|
|
|
|
|
|
|
|
Tricolporoidites sp. A Doyle and Robbins,1975 |
IIC-III (Rare in II)
|
|
|
|
|
|
|
|
|
|
|
|
|
| 162.8 | 49.6 | Early Cenomanian |
III
|
Uppermost Patapsco: Elkneck Beds of Maryland |
Nonmarine
|
Very good
|
Ajatipollis sp. A Doyle and Robbins, 1975 |
IIB-III, most common in III
|
The most common angiosperm in this sample is the pollen of Tricolporoidites B Doyle and Robbins, 1975, which is restricted to Zone III. Tricolporopollenites sp. A is also more common in Zone III. |
|
|
|
|
|
|
|
|
Clavatipollenites hughesi |
I-III
|
|
|
|
|
|
|
|
|
|
Granulatisprites dailyi |
Common in Zones IIC & III
|
|
|
|
|
|
|
|
|
|
Tricolporopollenites sp. B Doyle and Robbins, 1975 |
III
|
|
|
|
|
|
|
|
|
|
Tricolporoidites sp. B Doyle and Robbins, 1975 |
III
|
|
|
|
|
|
|
|
|
|
|
|
|
| 435.4 | 132.7 | Late Albian |
IIC-?III
|
Upper Patapsco |
|
Very poor
|
Araucariacites australis |
More abundant in II & IIC
|
There are no stratigraphically restricted palynomorphs in this poorly preserved sample. There is a lot of fusain and degraded vitrain present. This is common in terrains that have undergone forest fires. Usually only the most resistant spores survive. |
|
|
|
|
|
|
|
|
Cicatricosisporites hallei |
I-III
|
|
|
|
|
|
|
|
|
|
Gleicheniidites circinidites |
I-III
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Granulatisporites dailyi |
I-III (Common to IIC)
|
|
|
|
|
|
|
|
|
|
Taurocusporites reduncus |
II-III
|
|
| 465.3 | 141.8 | Late Albian |
IIC
|
Upper Patapsco |
Nonmarine
|
Very good
|
Araucariacites australis (very abundant) |
II-Cenozoic
|
The abundance of small, prolate tricolporates and the common appearance of Tricolporpollenites distinctus and Tricolporopollenites triangulus, together with the absence of any oblate tricolporates that are commonly found in Zone III, clearly place this sample in Zone IIC. |
|
|
|
|
|
|
|
|
Pinuspollenites spp. (very abundant) |
Broad range
|
|
|
|
|
|
|
|
|
|
Tricporpollenites distinctus |
IIC-III
|
|
|
|
|
|
|
|
|
|
Tricolporopollenites triangulus |
Rare in Upper IIB, first occurs/common in IIC/III
|
|
|
|
|
|
|
|
|
|
Tricolpopollenites minutus Brenner |
II-III
|
|
|
|
|
|
|
|
|
|
Tricolpopollenites micromunis |
II-III
|
|
| |
|
|
|
|
|
|
|
|
|
| 500.0 | 152.4 | Albian |
IIC
|
Upper Patapsco |
Nonmarine
|
Fair
|
Araucariacites australis |
Very abundant from II-Cenozoic
|
The assemblage is characterized by an abundance of Araucariacites australis and Pinuspollenites spp. as in the sample above at 465.3 ft. |
|
|
|
|
|
|
|
|
Brenneropollis peroreticulatus |
I-III
|
|
|
|
|
|
|
|
|
|
Pinuspollenites spp. (very abundant) |
Broad range
|
|
|
|
|
|
|
|
|
|
Tricolpites albiensis |
IIC-III
|
|
|
|
|
|
|
|
|
|
Tricolporoidites sp. A Doyle and Robbins, 1975 |
IIC-III
|
|
|
|
|
|
|
|
|
|
Tricolporoidites subtilis |
IIC-III
|
|
|
|
|
|
|
|
|
|
|
|
|
| 556.2 | 169.5 | Albian |
IIB
|
Upper Patapsco |
Nonmarine
|
Poor
|
Araucariacites australis (very abundant) |
II-Cenozoic
|
|
|
|
|
|
|
|
|
|
Appendicisporites segmentus |
II
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites hallei (abundant) |
I-II
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites patapscoensis |
IIB
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites potomacensis |
I-II
|
|
|
|
|
|
|
|
|
|
|
|
|
| 577.2 | 175.9 | Albian |
IIB
|
Upper Patapsco |
Nonmarine
|
Poor
|
Araucariacites australis (abundant) |
Common from II-Cenozoic
|
The appearance of C. patapscoensis at 557.2 and 556.2 ft indicates a Zone II date for both these samples. |
|
|
|
|
|
|
|
|
Cicatricosisporites hallei (abundant) |
I-II
|
|
|
|
|
|
|
|
|
|
Eucommiidites troedssoni |
I-II
|
|
|
|
|
|
|
|
|
|
Classopollis torosus |
I-IV
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites patapscoensis |
IIB
|
|
|
|
|
|
|
|
|
|
Clavatipollenites hughesi |
I-III
|
|
|
|
|
|
|
|
|
|
|
|
|
| 599.3 | 182.7 | Aptian |
I
|
Patuxent-Arundel |
Nonmarine
|
Fair
|
Classopollis torosus |
More common in Zone I
|
In samples 599.3, 641.05, and 806 ft the organic residue shows a marked increase in vitrain and fusain particles. There are no tricolpate or tricolporate pollen, or any pteridophyte spores that are typical of Zone II of the Patapsco Formation. There is also an increase in the pollen of Classopollis, Eucommiidites, Cicatricosisporites and smooth triangular trilete spores of the Cyatheaceae. This type of assemblage is characteristic of the Patuxent-Arundel Sequence in Maryland. |
|
|
|
|
|
|
|
|
Clavatipollenites hughesi |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Very small Cicatricosisporites spp. |
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites aralica |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites australensis |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Deltoidospora hallii (Cyatheaceae) |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Pilosisporites trichopapillosus |
Zone I-II
|
|
|
|
|
|
|
|
|
|
|
|
|
| 641.1 | 195.4 | Aptian |
I
|
Patuxent-Arundel |
Nonmarine
|
Fair to poor
|
Classopollis torosus |
More common in Zone I
|
See Discussion for sample 599.3 ft. |
|
|
|
|
|
|
|
|
Clavatipollenites hughesi |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Alisporites bilateralis |
I-II
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites spp. |
I-II
|
|
|
|
|
|
|
|
|
|
Cingulatisporites eukirchensoides |
I-II
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites australensis |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Cicatricosisporites dorogensis |
Restricted to Zone I
|
|
|
|
|
|
|
|
|
|
Deltoidospora hallii (Cyatheaceae) |
More common in Zone I
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Classopollis torosus |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Pilosisporites trichopapillosus |
I-II
|
|
|
|
|
|
|
|
|
|
|
|
|
| 806.0 | 245.7 | Aptian |
I
|
Patuxent-Arundel |
Nonmarine
|
Very poor
|
Cicatricosisporites spp. |
I-II
|
See Discussion for sample 599.3 ft. |
|
|
|
|
|
|
|
|
Cicatricosisporites australensis |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Classopollis torosus |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Deltoidospora hallii (Cyatheaceae) |
More common in Zone I
|
|
|
|
|
|
|
|
|
|
Trilobosporites crassus |
I-II
|
|
Note: Data in this table determined by G. Brenner.