Error like this:

    1. ImportError: dlopen(/anaconda/envs/GeoEnv3/lib/python3.6/site-packages/fiona/ogrext.cpython-36m-darwin.so, 2): Library not loaded: @rpath/libssl.1.0.0.dylib
    2.   Referenced from: /anaconda/envs/GeoEnv3/lib/libgdal.20.dylib
    3.   Reason: image not found

    Just remove defaults channel an reinstall:

    1. conda config --remove channels defaults
    2. conda create --name TEST python=3.6 geopandas --yes
    3. conda activate TEST
    6. conda config --add channels conda-forge
    7. conda config --get channels
    1. conda create -n py36 python=3.6 --yes
    2. conda activate py36
    3. conda install geopandas rasterio