We provide integrated services on Stratigraphy: Sequence Stratigraphy, palynology, calcareous nannofossils, foraminifera and other fossil groups.

Our partner laboratories located in Portuguese Universities use standardized, industry recognized methods.

Our consultant's experience includes the whole geological column, from Precambrian to recent sediments in different regions of the World.

All of our work is performed using standard routines and presented in digital format (on paper if requested) though a secure website and/or password blocked files.


Multiple organic-walled fossil groups can be analysed from rocks of terrestrial or marine origin. Allows age determination (biostratigraphy), Paleoenvironmental analysis (palynofacies), sequence stratigraphy (quantitative analysis of fossil groups).


Shell forming protozoa which can provide detailed age determination in sedimentary rocks from the Late Paleozoic to the Quaternary. Equally useful for paleoenvironmental determinations in the marine realm. Either as loose specimens or in thin sections, they can be easily analysed from outcrop, cuttings, side wall core or conventional core samples.


Some of the smallest fossils you can find, but also some of the most useful for age determination from the Jurassic to recent marine sediments. Even small (ca. 2g) samples may allow a statistically valid quantitative analysis.

Biostratigraphic campaigns and integration of vintage data

If you are preparing to drill a well we can advise on the sampling campaign. 

Oil&Gas companies often deal with vintage well reports which are difficult to harmonize with more recent data. Chronosurveys provides the service of re-interpreting old reports and other material, returning revised well tops, sedimentation ages, well correlation and other types of interpretation as requested.

Mineral exploration and metamorphic terranes stratigraphy

Obtaining valid stratigraphic data from Precambrian sediments and low-grade metamorphic rocks is often seen as impossible. Careful sampling and processing coupled with innovative observation techniques (reflected light observation, thin sectioning) opens a new perspective in the study of these rocks. Our consultants have the expertise on these difficult samples. Contact us to know more.


Extinct chordates “teeth” that allow high resolution biostratigraphy in Cambrian to Triassic rocks. Usually restricted to core and outcrop samples