|
Sample depth
|
|
|
|
|
|
|
|---|---|---|---|---|---|---|
|
(ft)
|
(m)
|
Comment
|
Observed diatoms
|
Interval
|
Age (Ma)
|
ECDZ
|
| 194.5 | 59.28 | Poorly sorted silt with organic material | Barren |
|
|
|
| 231.15 | 70.45 | Silt and clay | Barren |
|
|
|
| 265.45 | 80.91 | Mostly clastic quartz grains | Few Coscinodiscus fragments |
|
|
|
| 282.1 | 85.98 | Rare, poorly preserved diatoms, mostly fragments and sponge spicules | Coscinodiscus spp. | Unknown |
|
|
|
|
|
|
Melosira westii |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
| 313.1 | 95.43 | Common, moderately preserved diatoms | Actinocyclus octonarius | middle middle Miocene |
|
7 |
|
|
|
|
Actinocyclus cf. divisus |
|
|
|
|
|
|
|
Cymatogonia amblyoceras, triangular form |
|
|
|
|
|
|
|
Delphinei biseriata |
|
|
|
|
|
|
|
Delphinei novaecaesareae |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Raphoneis diamantella |
|
|
|
|
|
|
|
Raphoneis paralis |
|
|
|
| 340 | 103.63 | Abundant, well-preserved diatoms | Actinocyclus elipticus | middle middle Miocene | ~12.6–12 | 6 |
|
|
|
|
Actinocyclus octonarius |
|
|
|
|
|
|
|
Actinoptychus marylandicus |
|
|
|
|
|
|
|
Azpeitia vetustissimus |
|
|
|
|
|
|
|
Bogorovia lancettula |
|
|
|
|
|
|
|
Cavitatus jouseanus |
|
|
|
|
|
|
|
Coscinodiscus gigas var. diorama |
|
|
|
|
|
|
|
Cymatosira cf. lorenziana |
|
|
|
|
|
|
|
Delphineis biseriata |
|
|
|
|
|
|
|
Delphineis novaecaesareae |
|
|
|
|
|
|
|
Denticulopsis simonsenii |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Thalassiosira grunowii |
|
|
|
|
|
|
|
Thalassiosira leptopus |
|
|
|
| 370.9 | 113.05 | Abundant, moderately well preserved diatoms | Actinocyclus ellipticus | middle middle Miocene | ~12.6–12.3 | 6 |
|
|
|
|
Actinocyclus octonarius |
|
|
|
|
|
|
|
Bogorovia lancettula |
|
|
|
|
|
|
|
Coscinodiscus gigas var. diorama |
|
|
|
|
|
|
|
Crucidenticula nicobarica |
|
|
|
|
|
|
|
Cymatosira cf. lorenziana |
|
|
|
|
|
|
|
Delphineis angusata |
|
|
|
|
|
|
|
Denticulopsis simonsenii |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis paralis |
|
|
|
| 386.4 | 117.77 | Abundant, well-preserved diatoms | Actinocyclus octonarius | middle middle Miocene | ~13.0–12.3 | 6 |
|
|
|
|
Azpeitia vetustissimus |
|
|
|
|
|
|
|
Cavitatus jouseanus |
|
|
|
|
|
|
|
Coscinodiscus gigas var. diorama |
|
|
|
|
|
|
|
Crucidenticula nicobarica |
|
|
|
|
|
|
|
Cymatosira cf. lorenziana |
|
|
|
|
|
|
|
Delphineis angusata |
|
|
|
|
|
|
|
Delphineis novaecaesareae |
|
|
|
|
|
|
|
Denticulopsis simonsenii |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis paralis |
|
|
|
|
|
|
|
Thalassiosira grunowii |
|
|
|
| 399.1 | 121.65 | Abundant, well-preserved diatoms | Actinocyclus ellipticus | middle middle Miocene | ~13.0–12.3 | Lower 6 |
|
|
|
|
Coscinodiscus gigas var. diorama |
|
|
|
|
|
|
|
Crucidenticula nicobarica |
|
|
|
|
|
|
|
Cymatosira cf. lorenziana |
|
|
|
|
|
|
|
Delphineis cf. angusata |
|
|
|
|
|
|
|
D. novaecaesareae |
|
|
|
|
|
|
|
D. penelliptica |
|
|
|
|
|
|
|
Denticulopsis simonsenii |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis paralis |
|
|
|
| 443.1 | 135.06 | Few, poorly preserved diatoms; many clastic grains (sand?) | Coscinodiscus fragments | middle Miocene or younger, based on sample below |
|
|
|
|
|
|
Parlia sulcata |
|
|
|
|
|
|
|
Sceptroneis fragments |
|
|
|
|
|
|
|
Thalassionema nitzschioides |
|
|
|
| 453.9 | 138.25 | Abundant, moderately well preserved diatoms | Craspedodiscus coscinodiscus | early middle Miocene |
|
Lower 3–4 |
|
|
|
|
Delphineis cf. angustata |
|
|
|
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Delphineis penelliptica |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis fusiformis |
|
|
|
|
|
|
|
Rhaphoneis cf. magaritata |
|
|
|
|
|
|
|
Sceptoneis grandis |
|
|
|
|
|
|
|
Rhaphoneis hungarica |
|
|
|
| 487.2 | 148.5 | Abundant, moderately well preserved diatoms | Cavitatus jouseanus | early middle Miocene |
|
Lower 3–4 |
|
|
|
|
Coscinodiscus lewisianus |
|
|
|
|
|
|
|
Cymatogonia amblyoceras |
|
|
|
|
|
|
|
Delphineis lineata |
|
|
|
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Delphineis penelliptica |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis fusiformis |
|
|
|
|
|
|
|
Sceptoneis hungarica |
|
|
|
| 521.1 | 158.83 | Common, moderately well preserved diatoms | Actinocyclus octonarius (undulated form) | earliest middle Miocene |
|
Upper 2 |
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis margaritata |
|
|
|
|
|
|
|
Sceptroneis grandis |
|
|
|
|
|
|
|
Sceptroneis hungarica |
|
|
|
| 554.3 | 168.95 | Abundant, moderately well preserved diatoms | Actinocyclus octonarius (undulated form) | latest early to earliest middle Miocene |
|
Middle 2 |
|
|
|
|
Azpeitia vetustissimus |
|
|
|
|
|
|
|
Craspedodiscus coscinodiscus |
|
|
|
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis fusiformis |
|
|
|
|
|
|
|
Rhaphoneis margaritata |
|
|
|
|
|
|
|
Rhaphoneis scaralis |
|
|
|
|
|
|
|
Sceptoneis caduceus |
|
|
|
| 585.2 | 178.37 | Abundant, well-preserved diatoms | Actinocyclus octonarius (undulated form) | latest early to earliest middle Miocene |
|
Middle 2 |
|
|
|
|
Craspedodiscus coscinodiscus |
|
|
|
|
|
|
|
Delphineis cf. angustata |
|
|
|
|
|
|
|
Delphineis lineata |
|
|
|
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis margaritata |
|
|
|
|
|
|
|
Rhaphoneis scaralis |
|
|
|
|
|
|
|
Sceptoneis sp. |
|
|
|
|
|
|
|
Thalassiosira eccentrica |
|
|
|
| 611.7 | 186.45 | Abundant, well-preserved diatoms | Actinocyclus octonarius Ehrenberg (undulated form) | latest early to earliest middle Miocene |
|
Middle 2 |
|
|
|
|
Cavitatus jouseanus |
|
|
|
|
|
|
|
Cymatogonia amblyoceras |
|
|
|
|
|
|
|
Delphineis cf. angustata |
|
|
|
|
|
|
|
Delphineis lineata |
|
|
|
|
|
|
|
Delphineis ovata |
|
|
|
|
|
|
|
Paralia sulcata |
|
|
|
|
|
|
|
Rhaphoneis margaritata |
|
|
|
|
|
|
|
Rhaphoneis scaralis |
|
|
|
|
|
|
|
Thalassiosira eccentrica |
|
|
|
Notes: ECDZ = East Coast Diatom Zone of Andrews (1988). Age estimates based on Barron (2003).